CHM$141$
Professor$Jill$S.$Page$
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Molarity,$Solutions$and$Types$of$Reactions$Practice$
1. Suppose$a$solution$containing$3.50g$of$Na3PO4$is$mixed$with$a$solution$containing$6.40g$of$Ba(NO3)2.$$
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a) Write$a$balanced$molecular$equation$for$the$reaction.$
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b) Write$the$net$ionic$equation.$$Underline$the$precipitate.$
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c) How$many$grams$of$Ba3(PO4)2$can$be$formed?$
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2. To$determine$the$concentration$of$chloride$ion$in$a$100.0mL$sample$of$water,$a$chemist$adds$a$solution$of$
AgNO3$to$the$sample$to$precipitate$all$the$chlorine$ions$as$AgCl.$The$mass$of$the$precipitate$is$71.7mg.$$
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a) What$was$the$molarity$of$the$chloride$ion$in$the$original$sample$of$water?$$
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b) How$many$grams$of$chlorine$are$in$a$25mL$sample$of$the$water?$
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