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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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The compound sodium thiosutfate pentahydrate. Na 2 SO 3 5 H 2 O , is important commercially to the photography business as “hypo.” because it has the ability to dissolve unreacted silver salts from photographic film during development. Sodium thiosulfate pentahydrate can be produced by boiling elemental sulfur in an aqueous solution of sodium sulfite.

msp;  S 8 ( s ) + Na 2 SO 3 ( a q ) + H 2 O ( l ) Na 2 S 2 O 3 5 H 2 O ( s )

nbalanced)

at is the theoretical yield of sodium thiosulfate pentahydrate when 3.25 g of sulfur is boiled with 13.1 g of sodium sulfite? Sodium thiosulfate pentahydrate is very soluble in water. What is the percent yield of the synthesis if a student doing this experiment is able to isolate (collect) only 5.26 g of the product?

Interpretation Introduction

Interpretation:

The theoretical yield and percentage yield of Na2S2O3.5H2O should be calculated.

Concept Introduction:

A balanced chemical equation is an equation that contains same number of atoms as well as of each element of reactants and products of reaction.

For example, the reaction between lead sulphide and oxygen is as follows:

2 PbS +  3 O22PbO +  2SO2  Reactants            Products

The limiting reactant in a particular reaction has due to following properties:

  1. Limiting reactant completely reacted in a particular reaction.
  2. Limiting reactant determines the amount of the product in mole.
Explanation

Theoretical yield is also known as calculated yield. Theoretical yield is the amount of product which is theatrically calculates by the amount of limiting agent. It is the maximum amount of product which is formed in any reaction.

Other name of actual yield is observed yield.

The percentage yield is calculated by the actual or observed experimental yield divided by the theoretical yield and multiplied by 100.

The percentage yield can be calculates by the use of following expression:

Actual yield or given yield Theoretical yield or calculated yield ×100%   

Theoretical yield is the greatest amount of a product possible from a reaction, when assume that the reaction goes to 100% competition.

The balance equation for the calcium and oxalate ions is as follows:

S8 (s)+8Na2SO3(aq) + 40H2O(l) 8Na2S2O3.5H2O(s)

Given:

Amount of S8 = 3.25 g

Amount of Na2SO3 = 13.1 g

Calculation:

Number of moles of S8 and Na2SO3 are calculated as follows:

Number of moles=mass in gmolarmass=3.25 g256 g/mol=0.0127 moles S8Number of moles=mass in gmolarmass=13

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