The pH of a sample of gastric juice in a person’s stomach is 2.1. Calculate the pOH, [H + ], and [OH − ] for this sample. Is gastric juice acidic or basic?

Q: Expert Answer

Interpretation Introduction Interpretation: The pOH, [ H + ] and [ OH − ] of the given sample of gastric juice is to be calculated. The classification of this sample as acidic or basic is to be stated. Concept introduction: The pH of a solution is define as a figure that expresses the acidity of the alkalinity of a given solution. A logarithmic scale is used on which, the value 7 corresponds to a neutral species, a value less than 7 corresponds to an acid and a value greater than 7 corresponds to a base. The pH of a solution is calculated by the formula, pH = − log [ H + ] The sum, pH + pOH = 14 The equilibrium constant for water is denoted by K w and is expressed as, K w = [ H + ] [ OH − ] Explanation Explanation To determine: The pOH, [ H + ] and [ OH − ] of the given sample of gastric juice and the classification of this sample as acidic or basic. The [ H + ] is 8 . 0 × 1 0 - 3 M _ . Given pH = 2.1 The pH of a solution is calculated by the formula, pH = − log [ H + ] Rearrange the above expression to calculate the value of [ H + ] . [ H + ] = 10 − pH Substitute the given value of pH in the above expression. [ H + ] = 10 − 2.1 = 8 . 0 × 1 0 - 3 M _ The pOH of the given sample is 1 1 . 9 _ . Given pH = 2.1 The sum, pH + pOH = 14 Substitute the given value of pH in the above expression

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Chemistry: An Atoms First Approach

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Steven S. Zumdahl + 1 other

Publisher: Cengage Learning

ISBN: 9781305079243

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Chemistry: An Atoms First Approach

2nd Edition

Steven S. Zumdahl + 1 other

Publisher: Cengage Learning

ISBN: 9781305079243

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Answer 3

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Interpretation Introduction

Interpretation: The pOH, [H+] and [OH−] of the given sample of gastric juice is to be calculated. The classification of this sample as acidic or basic is to be stated.

Concept introduction: The pH of a solution is define as a figure that expresses the acidity of the alkalinity of a given solution. A logarithmic scale is used on which, the value 7 corresponds to a neutral species, a value less than 7 corresponds to an acid and a value greater than 7 corresponds to a base.

The pH of a solution is calculated by the formula, pH=−log[H+]

The sum, pH+pOH=14

The equilibrium constant for water is denoted by Kw and is expressed as,

Kw=[H+][OH−]

Explanation of Solution

Explanation

To determine: The pOH, [H+] and [OH−] of the given sample of gastric juice and the classification of this sample as acidic or basic.

The [H+] is 8.0×10-3 M_ .

Given

pH=2.1

The pH of a solution is calculated by the formula,

pH=−log[H+]

Rearrange the above expression to calculate the value of [H+] .

[H+]=10−pH

Substitute the given value of pH in the above expression.

[H+]=10−2.1=8.0×10-3 M_

The pOH of the given sample is 11.9_ .

Given

pH=2.1

The sum, pH+pOH=14

Substitute the given value of pH in the above expression

The pH of a sample of gastric juice in a person’s stomach is 2.1. Calculate the pOH, [H + ], and [OH − ] for this sample. Is gastric juice acidic or basic?

Chemistry: An Atoms First Approach

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Chemistry: An Atoms First Approach