GCSE Edexcel Chemistry Combined Science Acids and alkalis: 1. Barium hydroxide reacts with

Question

1. Barium hydroxide reacts with dilute hydrochloric acid to form barium chloride and water.

The equation for the reaction is

Ba(OH)₂(s) + 2HCl(aq) → BaCl₂(aq) + 2H₂O(l)

Which row of the table shows the correct state of each of the substances in the equation for the reaction?

| barium hydroxide | hydrochloric acid | barium chloride | water |
|------------------|-------------------|-----------------|-------|
| A                | solid             | aqueous          | aqueous| liquid |
| B                | liquid            | solid            | aqueous|
| C                | aqueous           | aqueous          | solid  | liquid |
| D                | aqueous           | liquid           | aqueous | aqueous |

(b) A student wanted to investigate how the pH of the mixture changes as barium hydroxide is added to dilute hydrochloric acid.

They followed this method.

step 1 measure out 50.0 cm³ of dilute hydrochloric acid into a beaker using a measuring cylinder

step 2 use a glass rod to place a drop of the acid onto a piece of universal indicator paper and record the pH

step 3 add 0.2 g of barium hydroxide to the acid in the beaker and stir

step 4 repeat steps 2-4 until there is no further change in the pH.

(i) Name a piece of equipment which could be used to measure out 50.0 cm³ of dilute hydrochloric acid more accurately than the measuring cylinder.

1. Barium hydroxide reacts with dilute hydrochloric acid to form barium chloride and water - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1

Worked Solution & Example Answer:1. Barium hydroxide reacts with dilute hydrochloric acid to form barium chloride and water - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1

Which row of the table shows the correct state of each of the substances in the equation for the reaction?

(i) Name a piece of equipment which could be used to measure out 50.0 cm³ of dilute hydrochloric acid more accurately than the measuring cylinder.

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