The amount (in grams) of formic acid present in 100 mL of the given formic acid solution has to be calculated. Concept Information: Acid ionization constant K a : Acids ionize in water. Strong acids ionize completely whereas weak acids ionize to some limited extent. The degree to which a weak acid ionizes depends on the concentration of the acid and the equilibrium constant for the ionization. The ionization of a weak acid HA can be given as follows, HA ( a q ) ⇄ H + ( a q ) + A - ( a q ) The equilibrium expression for the above reaction is given below. K a = [ H + ][A - ] [ HA] Where K a is acid ionization constant, [ H + ] is concentration of hydrogen ion [ A - ] is concentration of acid anion [ HA] is concentration of the acid pH definition: The concentration of hydrogen ion is measured using pH scale. The acidity of aqueous solution is expressed by pH scale. The pH of a solution is defined as the negative base-10 logarithm of the hydrogen or hydronium ion concentration. pH = -log[H + ] Molar mass: Molar mass is defined as mass of the chemical compound or chemical element divided by its amount. Molar mass= mass of the substance in grams moles To Calculate: The amount (in grams) of formic acid present in 100 mL of the given formic acid solution

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Chapter 16, Problem 16.101QP

Interpretation Introduction

Interpretation:

The amount (in grams) of formic acid present in 100 mL of the given formic acid solution has to be calculated.

Concept Information:

Acid ionization constant $Ka$ :

Acids ionize in water. Strong acids ionize completely whereas weak acids ionize to some limited extent.

The degree to which a weak acid ionizes depends on the concentration of the acid and the equilibrium constant for the ionization.

The ionization of a weak acid $HA$ can be given as follows,

$HA(aq)⇄H+(aq)+A-(aq)$

The equilibrium expression for the above reaction is given below.

$Ka = [H+][A-][HA]$

Where $Ka$ is acid ionization constant,

$[H+]$ is concentration of hydrogen ion

$[A-]$ is concentration of acid anion

$[HA]$ is concentration of the acid

$pH$ definition:

The concentration of hydrogen ion is measured using $pH$ scale. The acidity of aqueous solution is expressed by $pH$ scale.

The $pH$ of a solution is defined as the negative base-10 logarithm of the hydrogen or hydronium ion concentration.

$pH = -log[H+]$

Molar mass:

Molar mass is defined as mass of the chemical compound or chemical element divided by its amount.

$Molar mass=mass of the substance in gramsmoles$

To Calculate: The amount (in grams) of formic acid present in 100 mL of the given formic acid solution

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