Change Jn PH On Adding Calcium Hydroxidr To A Ficed Volume Of Dilute Hcl Flashcards Preview

Chemistry Core Practicals > Change Jn PH On Adding Calcium Hydroxidr To A Ficed Volume Of Dilute Hcl > Flashcards

Flashcards in Change Jn PH On Adding Calcium Hydroxidr To A Ficed Volume Of Dilute Hcl Deck (8)
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1
Q

What is the best piece of apparatus to measure the volume of hydrochloride acid?

A

50cm3 measuring cylinder

2
Q

Why is that the best piece of apparatus?

A

It’s more accurate than using a beaker

3
Q

How do you use universal indicator paper to measure the PH of the solution

A

The indicator paper changes colour and you match it to the colour chart to show the PH

4
Q

Why is it necessary to stir the mixture when the calcium hydroxide powder is added

A

To make sure all the powder reacts with an acid

5
Q

What are the main errors in this experiment?

A

Measuring the mass of the calcium hydroxide accurately

Making sure that all the calcium hydroxide reacts

6
Q

How could you improve the method

A

Use more precise balance +0.01 or + 0.001
Use a larger volume of acid
Use a narrow range indicator
Use a PH metre

7
Q

How do you know when the hydrochloride acid is exactly neutralised

A

Use the graph to work out the mass which produced a PH7

8
Q

Why does adding hydroxide ions (OH)- to an acid lead to an increase in PH

A

The hydroxide ions neutralise the hydrogen ions neutralise the hydrogen (H+) ions. This reduces the concentration of hydrogen ions and reduces PH