?Sodium thiosulfate (\(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\), the major

Chapter 9, Problem 9.60

(choose chapter or problem)

Sodium thiosulfate (\(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\), the major component in photographic fixer solution, reacts with silver bromide to dissolve it according to the following reaction:

\(\begin{aligned}

\operatorname{AgBr}(s)+2 \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}(a q) \\

\mathrm{Na}_{3} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}(a q)+\operatorname{NaBr}(a q)

\end{aligned}

)

(a) How many moles of \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) would be required to react completely with 0.450 g of AgBr?

 (b) How many mL of 0.02 M \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) contain this number of moles?

Text Transcription:

Na_SO_2O_3

AgBr(s) + 2 Na_2S_2O_3 (aq) arrow right Na_3Ag(s_2O_3) _2 (Aq) + NaBr (aq)