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1.1 Formulae, equations and hazards

1.1 Formulae, equations and hazards

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Question 29

To safely treat a spill of dilute hydrochloric acid on a laboratory bench, a technician sprinkles solid sodium hydrogencarbonate, NaHCO3(s)\text{NaHCO}_3\text{(s)}NaHCO3​(s), over the affected area until effervescence ceases.

Which of the following represents the correct balanced ionic equation, including state symbols, for this hazard-mitigating reaction?

A
HCO3−(aq)+H+(aq)→H2O(l)+CO2(g) \text{HCO}_3^-\text{(aq)} + \text{H}^+\text{(aq)} \rightarrow \text{H}_2\text{O(l)} + \text{CO}_2\text{(g)} HCO3−​(aq)+H+(aq)→H2​O(l)+CO2​(g)
B
NaHCO3(s)+H+(aq)→Na+(aq)+H2O(l)+CO2(g) \text{NaHCO}_3\text{(s)} + \text{H}^+\text{(aq)} \rightarrow \text{Na}^+\text{(aq)} + \text{H}_2\text{O(l)} + \text{CO}_2\text{(g)} NaHCO3​(s)+H+(aq)→Na+(aq)+H2​O(l)+CO2​(g)
C
NaHCO3(s)+H+(aq)→Na+(aq)+H2O(aq)+CO2(g) \text{NaHCO}_3\text{(s)} + \text{H}^+\text{(aq)} \rightarrow \text{Na}^+\text{(aq)} + \text{H}_2\text{O(aq)} + \text{CO}_2\text{(g)} NaHCO3​(s)+H+(aq)→Na+(aq)+H2​O(aq)+CO2​(g)
D
Na+(aq)+HCO3−(aq)+H+(aq)→Na+(aq)+H2O(l)+CO2(g) \text{Na}^+\text{(aq)} + \text{HCO}_3^-\text{(aq)} + \text{H}^+\text{(aq)} \rightarrow \text{Na}^+\text{(aq)} + \text{H}_2\text{O(l)} + \text{CO}_2\text{(g)} Na+(aq)+HCO3−​(aq)+H+(aq)→Na+(aq)+H2​O(l)+CO2​(g)
Markscheme

1.1 Formulae, equations and hazards Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 Formulae, equations and hazards

230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.

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