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ACID, BASE & SALT

Total questions: 65

Worksheet time: 1hrs 20mins

Name
Class
Date
1.

Salts

a)

are formed from joining positive and negative ions.

b)

increase OH- ions.

c)

forms a salt and water.

d)

increases H2O ions.

2.

A salt is formed when nitric acid combines with sodium hydroxide. What are present in the salt that forms?

a)

Sodium chloride

b)

sodium ions and nitrate ions

c)

only sodium ions

d)

only nitrate ions

3.

Salts that are made with hydrochloric acid are called ______________.

a)

chlorides

b)

sulfates

c)

nitrates

d)

carbonates

4.

Which of the following statements best define the term ‘salt’?

a)

Salt is formed when metal reacts with an alkali.

b)

Salt contains sodium ions and chloride ions.

c)

Salt is formed from a weak Van der Waals’ forces of attraction.

d)

Salt is formed when the hydrogen ions in an acid is replaced by metal or ammonium ions.

5.

Which of the following are the physical characteristics of salt crystal?


I They have similar size.

II They have fixed angle.

III They have fixed geometrical shapes.

IV They have flat surface, straight edges and sharp angles.

a)

I, II and III

b)

I, II and IV

c)

I, III and IV

d)

II, III and IV

6.

What are the products if magnesium reacts with hydrochloric acid?

a)

Magnesium chloride + Hydrogen

b)

Magnesium sulfate + Hydrogen

c)

Magnesium oxide + Hydrogen

d)

Magnesium sulfide + Hydrogen

7.

Which of the following is not a use of a salt as a food preservative?

a)

ammonium sulphate, (NH4)2SO4 to preserve fruit jam

b)

common salt, NaCl to prepare salted fish

c)

sodium benzoate, C6H5COONa to preserve sauces

d)

sodium nitrite, NaNO2 to preserve sausages

8.

Which of the following salts is prepared by precipitation method?

a)

sodium chloride

b)

barium sulfate

c)

calcium nitrate

d)

ammonium carbonate

9.

How would you prepare a sample of potassium chloride safely in the laboratory?

a)

Add excess potassium metal to dilute hydrochloric acid

b)

Titrate dilute HCl with aqueous KOH with an indicator

c)

Titrate dilute HCl with aqueous KOH once with indicator, then again without

d)

Mix aqueous potassium nitrate with aqueous sodium chloride

10.

Which of the following methods is used to prepare zinc sulfate?

a)

Add excess zinc chloride to aqueous sodium sulfate

b)

Tiltrate dilute H2SO4 with aqueous Zn(OH)2 with an indicator, then again without

c)

Add excess solid zinc oxide to dilute sulfuric acid

d)

Mix aqueous zinc nitrate with aqueous potassium sulfate

11.

After titrating aqueous NaOH with dilute HCl without indicator, what is my next step to obtain a sample of NaCl ?

a)

Filtration

b)

Evaporation to dryness

c)

Repeat the titration

d)

Evaporate to saturation, then cool the solution

12.

After adding aqueous Ca(NO3)2 to dilute H2SO4, what is my next step to prepare a sample of CaSO4?

a)

Crystallisation

b)

Evaporation to dryness

c)

Filtration to get the filtrate

d)

Filtration to get the residue

13.

Which of the following can be prepared by titration?

a)

Magnesium sulfate

b)

Zinc carbonate

c)

Lead (II) sulfate

d)

Lithium chloride

14.

Why is solid calcium hydroxide added in excess to dilute nitric acid when preparing calcium nitrate salt?

a)

To ensure all calcium hydroxide is used up

b)

To speed up the reaction

c)

To ensure all dilute nitric acid is used up

d)

To have maximum yield of calcium nitrate

15.

Which method of preparation of a pure salt solution requires the use of a pipette and burette?

a)

BaCl2 + Na2SO4 --> BaSO4 + 2NaCl

b)

CuO + HCl --> CuCl2 + H2O

c)

NaOH + HCl --> NaCl + H2O

d)

MgCO3 + H2SO4 --> MgSO4 + H2O + CO2

16.

Which pair of reagents can be used to prepare copper(II) sulfate salt?

a)

Copper metal with dilute sulfuric acid

b)

Copper(II) nitrate with sodium sulfate

c)

Copper(II) chloride and dilute sulfuric acid

d)

Copper(II) carbonate with dilute sulfuric acid

17.

Which two solutions, when mixed together, will form a precipitate?

a)

dilute hydrochloric acid and barium nitrate

b)

dilute sulfuric acid and sodium hydroxide

c)

dilute hydrochloric acid and lead (II) nitrate

d)

dilute nitric acid and zinc chloride

18.

Calcium carbonate reacts with nitric acid to form?

a)

calcium oxide

b)

calcium nitrate

c)

calcium chloride

d)

calcium sulfate

19.

Acid react with metal to form

a)

salt+ carbon dioxide

b)

salt + hydrogen

c)

Salt + Water

d)

Salt + metal oxide

20.

Salt breaks down ice by lowering the ...

a)

boiling point

b)

melting/freezing point

c)

elasticity point

d)

fire point

21.

What is it called when an acid and a base combine then form a salt and H2O

a)

Neutralization

b)

Acidification

c)

Chemical Bonding

d)

Ionic Reaction

22.

When CO2 is passed through lime water, it turns milky. the milkiness in due to formation of

a)

H2 O

b)

CaCO3

c)

CaO

d)

CO2

23.

When aqueous sodium carbonate (Na2CO3) with HCl(aq), it gives

a)

(a) NaOH, H2 (g) and CO2(g)

b)

(b) NaCl, H2 O and CO2(g)

c)

(c) NaHCO3, H2 (g) and CO2(g)

d)

(d) NaHCO3, H2 O and CO2(g)

24.

1. Three acidic solutions A, B and C have pH = 0, 3 and 5 respectively. Which solution has the highest concentration of H+ ions?

a)

A

b)

B

c)

C

d)

don't know

25.

tick the natural indicators

a)

turmeric

b)

phenophthalien

c)

iodine solution

d)

methylene blue

26.
Which of the following is a base?
a)
orange juice
b)
water
c)
vinegar
d)
dishwashing detergent
27.
Tastes bitter.
a)
Acids
b)
Bases
c)
Salts
d)
All
28.
Why does vinegar help preserve things like pickles? 
a)
It keeps moisture in. 
b)
It preserves flavors and crispness
c)
It kills bacteria that break down foods. 
d)
It keeps the cells alive
29.
What was red cabbage juice used as in the lab we performed?
a)
as an acid
b)
as a base
c)
as a colorant
d)
as an indicator
30.
What property do all three of these common household substances have in common?
a)
they are all basic
b)
they taste sour
c)
they have a pH below 7
d)
they all turn litmus paper red
31.

in aqueous solution, H+ ions exist as

a)

H30+

b)

H9O4+

c)

Neither of these

d)

either H30+ or H9O4+

32.
If you have a solution that is very acidic with a pH of 3.5, what can you do to raise the pH? 
a)
add more acid
b)
add more water
c)
increase the temperature
d)
add a base
33.
Ranging from 0 to 14, a pH value indicates how acidic or basic a solution is.  Which of these pH values would be a strong acid?
a)
2
b)
6
c)
9
d)
13
34.
Zn(OH)2 is an example of a...
a)
acid
b)
base
c)
salt
35.
The following neutralization reaction occurs in the classroom.
HCl  +  KOH  -->  H2O  +  KCl
If a student uses 25.0 mL of a 0.5M solution of KOH, what is the molarity of the acid if 15.0mL of acid neutralized?
a)
0.8M
b)
1.2M
c)
12.5M
36.

What is the endpoint of a titration

a)

Where the amount of acid and base are equal as shown by a color change

b)

Where there is no base

c)

When the volume of base in the burette is used up

d)

When there is no acid

37.

... are used to neutralise acid in the stomach.

a)

Toothpastes

b)

Bacterias

c)

Antacids

d)

More strong acids

38.

What is the purpose of an "indicator"?

a)

changes color if a chemical reaction occurs

b)

changes color if a physical change occurs

c)

changes color in the presence of an acid or base

d)

changes color when a salt dissolves in water

39.

The table shows the pH of several solutions. Which solution has the greatest concentration (amount) of H+ ions?

a)

vinegar

b)

milk

c)

water

d)

bleach

40.

What color is phenolphthalein in a base?

a)

colorless

b)

pink

c)

blue

d)

green

41.
What is the purpose of a titration?
a)
To find the pH of an acid
b)
To find the concentration of an unknown acid or base
c)
To find the volume of an unknown acid or base
d)
To find the pH of a base
42.
Calcium carbonate is sometimes used to treat “heartburn.”  What happens when calcium carbonate reaches the stomach? 
a)
Calcium carbonate absorbs excess stomach acid.
b)
Calcium carbonate neutralizes acid in the stomach. 
c)
Calcium carbonate increases the acidity of the stomach. 
d)
Calcium carbonate causes acid in the stomach to precipitate. 
43.
Which of these will react with zinc to produce hydrogen gas?
a)
sulfuric acid
b)
sodium sulfate
c)
ammonium hydroxide 
d)
sodium hydroxide 
44.
Pollution causes the pH of rain water fall below 6. What is such type of rain called?
a)
Acid rain
b)
polluted rain
c)
low pH rain
45.

metal oxides are generally

a)

acidic in nature

b)

basic in nature

c)

neutral

d)

some may be acidic some may be basic

46.

How would you prepare a sample of potassium chloride safely in the laboratory?

a)

Add excess potassium metal to dilute hydrochloric acid

b)

Titrate dilute HCl with aqueous KOH with an indicator

c)

Titrate dilute HCl with aqueous KOH once with indicator, then again without

d)

Mix aqueous potassium nitrate with aqueous sodium chloride

47.

Which of the following can be prepared by titration?

a)

Magnesium sulfate

b)

Zinc carbonate

c)

Lead (II) sulfate

d)

Lithium chloride

48.

Why is solid calcium hydroxide added in excess to dilute nitric acid when preparing calcium nitrate salt?

a)

To ensure all calcium hydroxide is used up

b)

To speed up the reaction

c)

To ensure all dilute nitric acid is used up

d)

To have maximum yield of calcium nitrate

49.

Which method of preparation of a pure salt solution requires the use of a pipette and burette?

a)

BaCl2 + Na2SO4 --> BaSO4 + 2NaCl

b)

CuO + HCl --> CuCl2 + H2O

c)

NaOH + HCl --> NaCl + H2O

d)

MgCO3 + H2SO4 --> MgSO4 + H2O + CO2

50.

Which pair of reagents can be used to prepare copper(II) sulfate salt?

a)

Copper metal with dilute sulfuric acid

b)

Copper(II) nitrate with sodium sulfate

c)

Copper(II) chloride and dilute sulfuric acid

d)

Copper(II) carbonate with dilute sulfuric acid

51.

Which two solutions, when mixed together, will form a precipitate?

a)

dilute hydrochloric acid and barium nitrate

b)

dilute sulfuric acid and sodium hydroxide

c)

dilute hydrochloric acid and lead (II) nitrate

d)

dilute nitric acid and zinc chloride

52.

Calcium carbonate reacts with nitric acid to form?

a)

calcium oxide

b)

calcium nitrate

c)

calcium chloride

d)

calcium sulfate

53.

Salt X soluble in water produced blue colour.

Possibly salt X contains....

a)

Iron(lll) ion

b)

Iron(ll) ion

c)

Copper(ll) ion

d)

Zinc ion

54.

Salt Y soluble in water produce brown solution.

Possibly salt Y contains ...

a)

Copper(ll) ion

b)

Iron(ll) ion

c)

Iron(lll) ion

d)

Ammonium ion

55.

Solid X is green colour.

Which of the following is a possibility of salt X?

a)

Iron(lll) chloride

b)

Iron(ll) sulphate

c)

Copper(ll) carbonate

d)

Copper(ll) chloride

56.

Green solid salt A dissolved in water produce green colour solution.

Salt A could be

a)

Copper(ll) carbonate

b)

Iron(ll) nitrate

c)

Copper(ll) chloride

57.

Green colour of salt A dissolves in water produce blue colour solution.

a)

Copper(ll) chloride

b)

Copper(ll) sulphate

c)

Copper(ll) nitrate

d)

Copper(ll) carbonate

58.

Which of the following salts powder is white colour.

a)

Ammonium nitrate

b)

Iron(lll) chloride

c)

Iron(ll) nitrate

d)

Lead(ll) oxide

59.

When hot this substance in yellow colour. But when cold it turns to white colour. This is

a)

Lead(ll) oxide

b)

Zinc oxide

c)

Iron(lll) oxide

d)

Iron(ll) oxide

60.

Which of the following is white solid and dissolves in water?

a)

Sodium carbonate

b)

Barium sulphate

c)

Calcium chloride

d)

Magnesium carbonate

61.

Iron(lll) salts has.... colour

a)

Green

b)

Brown

c)

Blue

d)

Black

62.

Copper(ll) carbonate has...colour

a)

Blue

b)

Green

c)

Black

63.

Which of the following is insoluble salt

a)

Ammonium carbonate

b)

Magnesium sulphate

c)

Lead(ll) chloride

d)

Zinc nitrate

64.

Solid copper(ll) chloride has..colour

a)

Blue

b)

Green

65.

Copper(ll) chloride dissolves in water produce...solution

a)

Green

b)

Blue

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