   Chapter 4.8, Problem 4.11CYU

Chapter
Section
Textbook Problem

Hydrochloric acid. HCl, with a concentration of 0.100 M can be purchased from chemical supply houses, and this solution can be used to standardize the solution of a base. If titrating 25.00 mL of a sodium hydroxide solution to the equivalence point requires 29.67 mL of 0.100 M HCI, what is the concentration of the base?

Interpretation Introduction

Interpretation:

The concentration of NaOH used in the given titration process has to be determined.

Concept introduction:

Numberofmole=GivenmassofthesubstanceMolarmass

• 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.
• Concentrationofsubstance=Amountof substancevolumeofthesubstance
• Amountof substance=Concentrationofsubstance×volumeofthesubstance
• Titration is a method to determine the concentration of a substance in solution by adding a solution of known volume and concentration until the reaction is completed.
Explanation

The balanced equation for the reaction is,

NaOH+HClNaCl+H2O

The amount (moles) of HCl can be calculated as follows,

0.100molHCl1L×0.02967L=0.002967molHCl

The balanced equation for the reaction shows that 1mol of HCl requires 1mol of NaOH this is the required stoichiometric factor to obtain the amount of NaOH in 25.00mL of solution.

Thus the amount of NaOH can be calculated as follows,

(0

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