Chapter 9, Problem 9.60AP

Sodium thiosulfate (Na₂S₂O₃), the major component in photographic fixer solution, reacts with silver bromide to dissolve it according to the following reaction:

  $\text{AgBr}\left(s\right){\text{+2 Na}}_{\text{2}}{\text{S}}_{\text{2}}{\text{O}}_{\text{3}}\left(aq\right)\to {\text{Na}}_{\text{3}}\text{Ag}{\left({\text{S}}_{\text{2}}{\text{O}}_{\text{3}}\right)}_{\text{2}}\left(aq\right)+\text{NaBr}\left(aq\right)$

(a)    How many moles of Na₂S₂O₃ would be required to react completely with 0.450 g of AgBr?

(b)    How many mL of 0.02 M Na₂S₂O₃ contain this number of moles?