Monitoring chemical reactions

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Question 40

Medium

A student investigates the neutralisation reaction between potassium hydroxide solution and dilute nitric acid.

They do a titration experiment.

The diagram shows the apparatus they use.

A titration setup containing a burette labeled X held on a stand, containing potassium hydroxide solution. The burette is dripping into a conical flask below which contains 25 cm³ of dilute nitric acid and phenolphthalein indicator. Below the conical flask is a white tile.

What is the name of the piece of equipment labelled X?

[1]

The student places the conical flask on a white tile. Explain why.

[1]

The student adds the alkali to the acid drop by drop near the endpoint of the titration. Explain why.

[1]

The neutralisation reaction between potassium hydroxide solution, $KOH\text{KOH}$ , and dilute nitric acid, $HNO3\text{HNO}_3$ , makes a salt and water.

Write the balanced symbol equation for the reaction.

[1]

In another neutralisation reaction, dilute sulfuric acid, $H2SO4\text{H}_2\text{SO}_4$ , reacts with sodium hydroxide solution, $NaOH\text{NaOH}$ .

$H2SO4+2NaOH→Na2SO4+2H2O\text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}$

Calculate the mass of sodium sulfate, $Na2SO4\text{Na}_2\text{SO}_4$ , that could be made from $g8.50\text{ g}$ of dilute sulfuric acid, $H2SO4\text{H}_2\text{SO}_4$ .

Give your answer to 3 significant figures.

Relative atomic mass ( $A_r$ ): $H=1.0\text{H} = 1.0$ , $Na=23.0\text{Na} = 23.0$ , $O=16.0\text{O} = 16.0$ , $S=32.1\text{S} = 32.1$

[3]

Monitoring chemical reactions

Question 40

Monitoring chemical reactions Questions

Monitoring chemical reactions

Question 40

Monitoring chemical reactions Questions