Question

250 mL of sodium carbonate solution contains $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$. If 10 mL of this solution is diluted to 500 mL. the concentration of the diluted acid will be

• A. $0.01$M
• B. $0.001 M$
• C.
• D. $0.002 M$

Answer 1

Answer: (D)

$0.002 M$

Answer 2

Morality of $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ solution

$= \frac { 2.65 } { 106 } \times \frac { 1000 } { 250 } = 0.1 \mathrm { M }$

10 mL of this solution is diluted to 500 mL