Reactions of acids

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Question 28
Medium

Malonic acid is a white crystalline solid at room temperature.

a.

Calculate the mass of malonic acid (H2C3H2O4\text{H}_2\text{C}_3\text{H}_2\text{O}_4H2​C3​H2​O4​) needed to make 500 cm3500\text{ cm}^3500 cm3 of a solution with concentration 0.0450 mol/dm30.0450\text{ mol/dm}^30.0450 mol/dm3.

Relative formula mass (MrM_rMr​): H2C3H2O4=104\text{H}_2\text{C}_3\text{H}_2\text{O}_4 = 104H2​C3​H2​O4​=104

[2]
b.

A student found that 20.0 cm320.0\text{ cm}^320.0 cm3 of a potassium hydroxide solution was neutralised by 16.80 cm316.80\text{ cm}^316.80 cm3 of the 0.0450 mol/dm30.0450\text{ mol/dm}^30.0450 mol/dm3 malonic acid solution.

The equation for the reaction is:

H2C3H2O4+2KOH→K2C3H2O4+2H2O\text{H}_2\text{C}_3\text{H}_2\text{O}_4 + 2\text{KOH} \rightarrow \text{K}_2\text{C}_3\text{H}_2\text{O}_4 + 2\text{H}_2\text{O}H2​C3​H2​O4​+2KOH→K2​C3​H2​O4​+2H2​O

Calculate the concentration of the potassium hydroxide solution in mol/dm3\text{mol/dm}^3mol/dm3.

[3]

Reactions of acids Questions

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