Ph and Acid Properties

Starter​
What properties of Acids can you remember?

Multiple Choice

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid

Multiple Choice

Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?

• strongly acidic
• slightly acidic
• strongly basic
• slightly basic

Multiple Choice

Which is the stronger acid?

• pH 1
• pH 4
• pH 8
• pH 13

Multiple Choice

If an acid is combined with a base of equal strength, the result will most likely be

• a neutral solution.
• a stronger acid.
• impossible to tell without testing the pH.
• a stronger base

Acids – produce H+
Bases - produce OH-

Acids – donate H+
Bases – accept H+

Arrehenius

Bronsted-Lowry

HCl
Lemon Juice
Soda

NaOH
Bleach
Soap

Acids

Bases

H2SO4
Acid Rain
Vinegar

KOH
Ammonia
M.O.M

Multiple Choice

 Which of the following is an acid?

• shampoo
• baking soda
• orange juice
• water

1.pH < 7.0

2.Taste Sour

3.React with metals

4.Turn litmus paper red

Multiple Select

Which of the set of pH paper depicts that the dipped solution is highly acidic?

(compare with the pH scale and find out)

Multiple Choice

What are properties of acids?

• Bitter, slippery, ph above 7
• Sour, reacts with metals, ph below 7
• Sour, reacts with metals, ph above 7
• Bitter, ph of 7, does not react with metals

Multiple Choice

A weak acid

• is a concentrated solution
• dissociates completely
• is a dilute solution of OH ions
• partially dissociates

Multiple Choice

A dilute acid

• can be either a strong or weak acid
• is a weak acid
• is a strong acid
• a strong base

1.pH > 7.0

2.Taste Bitter

3.Slippery, soapy feeling

4.Turn litmus paper blue

1.Conduct electricity (electrolytes)

2.React with indicators

Categorize

Options (15)

sour taste

covalently bonded

metal react with acid to form H₂ gas

hydronium ions

H₃PO₄

ionically bonded

bitter taste

hydroxide ions

NH₃

bleach

electrolyte

aqueous

form ions in solution

cause indicators to change color

Ba(OH)₂

Sort the following properties as either properties of an acid, properties of a base, or properties of both.

Acid Property

Base Property

Acid & Base Property

Chemicals which
change colors when
they are put into
acids or bases.

Acid + Base → Water + Ionic Compound

(Neutralization Reactions)

HCl + KOH →
HOH

+ KCl

H2SO4 + 2KOH →
2H2O + K2SO4

Multiple Choice

Metal oxide + acid -->

• salt + water

• salt + oxygen

• salt + hydrogen

• salt + water + carbon dioxide

Multiple Choice

metal + acid -->

• salt + hydrogen

• salt + water

• salt + carbon dioxide

Multiple Choice

acid + base -->

• salt + water

• salt + oxygen

• salt + carbon dioxide

Multiple Choice

When an acid and a base react, a ______________ reaction takes place.

• Displacement

• Oxidation

• Neutralisation

• Transamination

Multiple Choice

Metal hydroxide + acid -->

• salt + water

• salt + oxygen

• salt + hydrogen

• salt + water + carbon dioxide

Multiple Choice

Metal carbonate + acid -->

• salt + water

• salt + oxygen

• salt + hydrogen

• salt + water + carbon dioxide

Multiple Choice

Complete the following reaction:
Sulphuric acid + sodium carbonate
--> 

• Carbon dioxide + water 
• calcium carbonate + water + carbon dioxide 
• Sodium sulphate + water + carbon dioxide 
• Sodium chloride + water + carbon dioxide 

Multiple Choice

Complete the following reaction:

Hydrochloric acid + magnesium hydroxide -->

• Magnesium chloride + water

• Magnesium + water

• Magnesium chloride + hydrogen

• Magnesium chloride + water + carbon dioxide

Multiple Choice

Complete the following reaction:

Sulphuric acid + magnesium oxide -->

• Magnesium sulphate + water

• Magnesium + water

• Magnesium sulphate + hydrogen

• Magnesium sulphate + water + carbon dioxide

Multiple Choice

Complete the following reaction:

Nitric acid + sodium -->

• Sodium nitrate + water

• Sodium + Water

• Sodium nitrate + hydrogen

• Sodium nitrate + water + carbon dioxide

pH = -log[H+]

If [H+] = 1 x 10-4, then pH =

- measures the concentration of H+ions

(How acidic or basic a solution is)

4

If [H+] = 1 x 10-13, then pH =

13

If [H+] = 1 x 10-7, then pH =

7

Multiple Choice

If a solution is basic which ion will be more present?

• H+

• OH+

• OH-

• H-

Multiple Choice

What ion did Arrhenius attribute the properties of acidic solutions?

• H⁺

• OH^-

• H^-

• OH⁺

Multiple Choice

If a solution has a [H⁺] of 9.3x10^-11, what is the pH?

• 10.0

• 4.0

• 3.5

• 8.2

Multiple Choice

The pH of a solution is 8.43. What is the hydronium ion H⁺ concentration?

• 3.7 x 10^-9 M

• 2.7 x 10^-6 M

• 1.0 x 10^-8.43 M

• 1.0 x 10^-14

Multiple Choice

If the [OH-] of a solution is 2.7 x 10^-4 mol/L the pOH of the solution is

• 10.44
• 3.56
• 1.00
• -4.43

Multiple Choice

If a solution has a [OH^-] of 2.3x10^-4, it must be a(n)...

• Acid

• Base

• Neutral

Multiple Choice

If the pH of a solution is 5.6 the pOH is

• 6.5
• 12.4
• 8.4
• 5.6

If [OH-] = 10-8M, what is the pH?

[H+][OH-] = 10-14

pH + pOH = 14

• the pOH = 8, so the pH must be 14 – 8

• So the pH = 6