4 AE 0 My Notes Ask Your Teach uring the developing process of black-and-white f

Question

4 AE 0 My Notes Ask Your Teach uring the developing process of black-and-white film, silver bromide is removed from photographic film by the fixer. The major component of the fixer is sodium thiosulfate. The net ionic quation for the reaction is given below. Ager(s) + 2 S2032-(aq) Ag(S203)23-(aq) + Br.(ag) What mass of Agbr can be dissolved by 1.36 of o.212 M Na25203? 2560 points 1 Prevo Answers AE 00 My Notes Ask Your Teachs when hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magneslum chloride äre produced. what volume of 6.0 M HCl is required to react completely with 3.00 of magnesium? 92 28

Explanation / Answer

AgBr(s) + 2S2O3^2-(aq) --------> [Ag(S2O3)2]^3- (aq) + Br^- (aq)
no of moles of Na2S2O3 = molarity * volume in L
                         = 0.212*1.38   = 0.29 moles
2 moles of Na2S2O3 react with 1 moles of AgBr
0.29 moles of Na2So3 react with = 1*0.29/2 = 0.145 moles of AgBr
mass of Agbr = no of moles * gram molar mass
              = 0.145*188 = 27.26g >>>>answer
Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)
no of moles of Mg = W/G.A.Wt
                   = 3/24 = 0.125 moles
1 mole of Mg react with 2 moles of HCl
0.125 moles of Mg react with = 2*0.125/1   = 0.25 moles of HCl
no of moles of HCl   = molarity * volume in L
0.25                 = 6*volume in L
volumein L            = 0.25/6   = 0.042L
volume of HCl in ml    = 42ml>>>answer

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