Free Printable T2 PS: Acids and Bases

1.

Write down the name of the experimental procedure illustrated above.

(a)

2.

The function of a burette is to measure the volume of acid needed to reach endpoint to base.

Is this written function true or false?

(a)

3.

Acid in terms of the Arrhenius theory produces hydrogen ions when dissolved in water.

Is this definition in terms of Arrhenius theory correct or not?

Write only true or false?

(a)

4.

Give a reason why sulphuric acid is regarded as a strong acid.

a)

ionises completely

b)

ionises partially

c)

dissolves completely

5.

Bromothymol blue is used as indicator.

Choose the color change that takes place in the Erlenmeyer flask on reaching the endpoint of the titration.

a)

BLUE TO YELLOW

b)

YELLOW TO BLUE

c)

GREEN TO YELLOW

6.

Determine the volume of

H_2SO_4\left(aq\right)

which must be added to neutralise the NaOH(aq) in the Erlenmeyer flask completely.

a)

$11,5\ cm^3$

b)

$12\ cm^3$

c)

$12,5\ cm^3$

7.

If the learner passes the endpoint by adding $5\ cm^3$ of $H_2SO_4\left(aq\right)$ in excess, calculate the pH of the solution in the flask.

Choose the correct answer.

a)

$1,30$

b)

$1,63$

c)

$2,76$

8.

Write down the FORMULAE of the base that is water in the equation.

hint: write down the formulae only in the form H2SO4 for $H_2SO_4$ .

(a)

9.

Is sulphuric acid a STRONG or a WEAK acid?

Answer only with STRONG or WEAK.

(a)

10.

They use $24\ cm^3$ of $H_2SO_4\left(aq\right)$ in titration to neutralise $26\ cm^3$ of $NaOH\left(aq\right)$ .

Calculate the concentration of the $NaOH\ \left(aq\right)$ .

a)

$0\ mol\cdot dm^{-3}$

b)

$0,28\ mol\cdot dm^{-3}$

c)

$0,3\ mol\cdot dm^{-3}$

11.

In an experiment $30\ cm^3$ of $H_2SO_4\left(aq\right)$ is added to $20\ cm^3$ of $0,28\ mol\cdot dm^{-3}$ NaOH solution in a beaker.

Calculate the pH of the final solution.

a)

$1$

b)

$1,2$

c)

$1,17$

12.

Write down the term used for the underlined phrase above

a)

Weak acid

b)

Strong acid

13.

An ethanoic acid solution has a pH of 4 at $25\degree C$ .

Calculate the concentration of the hydronium ions, $H_3O^+\left(aq\right)$ in the solution.

a)

$1\times10^{-4}\ mol\cdot dm^{-3}$

b)

$11\times10\ mol\cdot dm^{-3}$

c)

$1\ \times10\ mol\cdot dm^{-4}$

14.

Sihle claims that according to Arrhenius theory, a base is a substance that produces hydroxide ions.

Is this claim correct.

Write only True or False.

(a)

15.

Calculate the mass of potassium hydroxide used to prepare the solution above in the $250\ cm^3$ volumeric flask.

a)

$4,5\ g$

b)

$4,48\ g$

c)

$5\ g$

16.

Will the pH of the solution in the conical flask at the end point be GREATER THAN 7, SMALLER THAN 7 or EQUAL TO 7?

Write only GREATER THAN 7, SMALLER THAN 7 or EQUAL TO 7.

(a)

17.

The following statement is true regarding the term hydrolysis of a salt.

a)

Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming either an acidic or basic solution.

b)

Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming only an acidic solution.

c)

Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming a solution that is neither acidic or basic.

18.

A learner dissolves ammonium chloride $\left(NH_4Cl\right)$ crystals in water and measures the pH of the solution.

Will the pH of the solution be GREATER THAN, SMALLER THAN or EQUAL TO 7?

Write only GREATER THAN, SMALLER THAN or EQUAL TO 7.

(a)

19.

A sulphuric acid solution is prepared by dissolving 7,35 g of $H_2SO_4\left(l\right)$ in $500\ cm^3$ of water.

Calculate the number of moles of

H_2SO_4

present in this solution.

a)

0,8 mol

b)

0,08 mol

c)

0,9 mol

20.

Define an acid according to the Lowry-Brønsted theory

4 lines

T2 PS: Acids and Bases

Total questions: 20

Worksheet time: 5hrs 0mins

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