Question

For the galvanic cell :
$Al ( s )\left| Al ^{3+}( aq )(0.1 M ) \| Ag ^{+}( aq )(0.1 M )\right| Ag ( s )$,
which of the following is/are correct?

• A. Reaction quotient $Q=1.0 \times 10^{-2}$
• B. $\log _{10} Q=3$
• C. $Q=1.0 \times 10^{3}$
• D. $Q=1.0 \times 10^{2}$

Answer 1

Answer: (D)

$ Al ( s )+3 Ag ^{+}( aq ) \longrightarrow Al ^{3+}( aq )+3 Ag ( s )$
$Q= \frac{\left[ Al ^{3+}\right]}{\left[ Ag ^{+}\right]^{3}}=\frac{0.1}{0.1^{3}}=10^{2} $
$ \log _{10} Q=\log _{10} 10^{2}=2 \log _{10} 10=2$