Sodium thiosulfate Na2 S203, the major component in photographic fixer solution,

Question

Sodium thiosulfate Na2 S203, the major component in photographic fixer solution, reacts with silver bromide to dissolve it according to the following reaction: AgBr(s) + 2Na2s,03 (aq)Na3 Ag(S20s)2 (aq) + NaBr (aq) Part A How many moles of NayS20s would be required to react completely with 0.440 g of AgBr? Express your answer using three significant figures. mol Submit My Answers Give Up Part B How many mL of 0.020 M Na2S2Os contain this number of moles? Express your answer using two significant figures. mL Submit My Answers Give Up

Explanation / Answer

Ans

Part A :

Number of moles of AgBr = 0.440 / 187.77 = 0.00234 moles

1 mole of AgBr requires 2 moles of Na2S2O3

So 0.00234 moles of it will require 2 x 0.00234

= 0.00468 moles of Na2S2O3.

Part B :

Volume = number of moles / molarity

= 0.00468 / 0.020

= 0.234 L

= 230 mL

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