GCSE Edexcel Chemistry Acids and alkalis: Barium hydroxide reacts with dil

Question

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

(a) 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              | liquid          | aqueous |
| B                | aqueous            | solid           | aqueous |
| C                | aqueous            | aqueous         | liquid |

(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**: Use a pipette to place a drop of the acid onto a piece of universal indicator paper and record the pH.

**step 2**: Add 50.0 cm³ of dilute hydrochloric acid to a beaker using a measuring cylinder.

**step 3**: Add 0.2 g of barium hydroxide to the acid in the beaker and stir.

**step 4**: Use a dropper to place a drop of the mixture onto a fresh piece of indicator paper and record the pH again.

**step 5**: Repeat steps 3–4 until there is no further change in the pH.

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

Barium hydroxide reacts with dilute hydrochloric acid to form barium chloride and water - Edexcel - GCSE Chemistry - Question 8 - 2022 - Paper 1

Worked Solution & Example Answer:Barium hydroxide reacts with dilute hydrochloric acid to form barium chloride and water - Edexcel - GCSE Chemistry - Question 8 - 2022 - Paper 1

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

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

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