   Chapter 4, Problem 29PS

Chapter
Section
Textbook Problem

Nickel(II) sulfide, NiS, occurs naturally as the relatively rare mineral millerite. One of its occurrences is in meteorites. To analyze a mineral sample for the quantity of NiS, the sample is dissolved in nitric add to form a solution of Ni(NO3)2.NiS(s) + 4 HNO3(aq) → Ni(NO3)2(aq) + 2 NO2(g) + 2 H2O(l) + S(s)The aqueous solution of Ni(NO3)2 is then reacted with the organic compound dimethylglyoxime (C4H8N2O2) to give the red solid Ni((C4H7N2O2)2.Ni(NO3)2(aq) + 2 (C4H8N2O2)(aq) → Ni(C4H7N2O2)2 + 2 HNO3(aq)Suppose a 0.468-g sample containing millerite produces 0.206 g of red, solid Ni(C4H7N2O2)2What is the mass percent of NiS in the sample? Interpretation Introduction

Interpretation:

The mass percent of NiS in the given sample has to be determined.

Concept introduction:

• The relation between the number of moles and mass of the substance is ,

Numberofmole=MassingramMolarmass

Massingramofthesubstance=Numberofmole×Molarmass

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.
• Stoichiometric factor is a relationship between reactant and product which is obtained from the balanced chemical equation for a particular reaction.
• Amountof substance=Concentrationofsubstance×volumeofthesubstance
• Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
Explanation

Herein to analyze a mineral sample for the quantity of NiS, the sample is dissolved in nitric acid to form a solution of Ni(NO3)2

The balanced equation for this reaction is,

NiS(s)+4HNO3(aq)Ni(NO3)2(aq)+2NO3(g)+2H2O(l)+S(s)

The aqueous solution of Ni(NO3)2 is then reacted with the organic compound dimethylglyoxime C4H8N2O2 to give the red solid Ni(C4H7N2O2)2

Ni(NO3)2(aq)+2C4H8N2O2(aq)Ni(C4H8N2O2)2(s)+2HNO3(aq)

From the amount of Ni(C4H8N2O2)2 involved in the reaction, amount of NiS can be calculated

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