Some Basic Concepts of Chemistry - Result Question 33
Subjective Questions
33. How many millilitres of $0.5 M H _2 SO _4$ are needed to dissolve $0.5 g$ of copper (II) carbonate?
(1999, 3M)
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Answer:
Correct Answer: 33. (8.096mL)
Solution:
- The balanced chemical reaction is
$\begin{aligned} & \mathrm{CuCO}_3+\mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \mathrm{CuSO}_4+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2 \\ & \text { millimol of } \mathrm{CuCO}_3=\frac{0.5 \times 1000}{123.5}=4.048 \\ & \Rightarrow \quad \text { Millimol of } \mathrm{H}_2 \mathrm{SO}_4 \text { required }=4.048 \\ & \because \quad \text { Millimol }=\text { Molarity } \times \text { Volume (in } \mathrm{mL} \text { ) } \\ & \Rightarrow \quad \text { Volume }=\frac{4.048}{0.50}=8.096 \mathrm{~mL} \end{aligned}$
BETA
