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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Calculate the pH of a 1.0 × 10−7-M solution of NaOH in water.

Interpretation Introduction

Interpretation: The concentration of NaOH solution in water is given. By using this value, the pH value of NaOH in water is to be calculated.

Concept introduction: The pH value is the measure of H+ ions. The pH is calculated using the formula,

pH=log10[H+]

Explanation

Explanation

To determine: The pH value of NaOH solution in water.

The concentration of H+ ion is 6.18×108M_ .

Given

The concentration of OH from NaOH is 1.0×107M .

The pH can be calculated by considering the relationship between the molarities of three principle ion solution Na+,H2O and OH .

The autoionization of water involves formation of hydroxide ion and H+ ion due to transfer of a proton from one water molecule to another.

The reaction of ionization of water is,

H2O(l)H+(aq)+OH(aq)

It is assumed that the change in concentration of [H+] is x .

Make the ICE table for the above reaction.

H2O(l)H+(aq)OH(aq)Initial:01.0×107Chang:xxEquilibrium:x1.0×107+x

The ion product constant for water is given as,

Kw=[H+][OH]

Where,

  • Kw is ion product constant of water (1

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Chapter 14 Solutions

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