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2 Acids can undergo neutralisation to form salts - Edexcel - GCSE Chemistry - Question 2 - 2017 - Paper 1
Question 2
2 Acids can undergo neutralisation to form salts. (a) Complete the sentence by putting a cross (X) in the box next to your answer. An acid reacts with a metal oxid... show full transcript
Worked Solution & Example Answer:2 Acids can undergo neutralisation to form salts - Edexcel - GCSE Chemistry - Question 2 - 2017 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
Answer
An acid reacts with a metal oxide to form D a salt + water. In neutralisation reactions involving acids and metal oxides, the products typically include a salt and water, following the general reaction:
ightarrow ext{Salt} + ext{Water} $$Step 2
Describe what you would see when solid calcium carbonate reacts with dilute hydrochloric acid.
Answer
When solid calcium carbonate (CaCO₃) reacts with dilute hydrochloric acid (HCl), you would observe several phenomena:
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Effervescence: Bubbles of carbon dioxide gas () will be produced, which can be seen escaping from the reaction mixture.
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Dissolution: The solid calcium carbonate will gradually dissolve, and you will notice a clear solution forming as the reaction proceeds.
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Temperature Change: The reaction may feel warm to the touch due to the exothermic nature of the process.
This reaction visually demonstrates the neutralisation process as the caustic acid reacts with the carbonate, releasing gas and forming a salt in solution.