   Chapter 16, Problem 38PS

Chapter
Section
Textbook Problem

Ammonium chloride and sodium dihydrogen phosphate, NaH2PO4, are mixed in water. Write a balanced equation for the acid-base reaction that could, in principle, occur. Using Table 16.2, decide whether the equilibrium lies predominantly to the right or to the left.

Interpretation Introduction

Interpretation:

Balanced reaction has to written for acid-base reaction equilibrium occuring between NH4Cl and NaH2PO4, and the direction of the equilibrium has to be predicted

Concept introduction:

Balanced reaction is a chemical reaction in which number of atoms for each element in the reaction and the total charge are same on both reactant side and the product side.

Steps in balancing the information

• Step 1: Write the unbalanced equation
• Step 2: Find the coefficient to balance the equation.
• The coefficient should be reduced to the smallest whole number

An acid-base reaction reaction is represented as written below.

HA(aq)+B(aq)   BH+(aq)  +    A(aq)(acid)    (base)        (conjugate     acid)   (conjugate     base)

The base will take up the proton from acid and form its conjugate acid and simultaneously acid will form its conjugate base. The equilibrium will be forward or backward can be determined by using the dissociation constants (Kaand Kb) for reactants as well as of the products.

Explanation

The acid-base reaction between NH4Cl and NaH2PO4 is written as follows

NH4Cl(aq)+ NaH2PO4(aq)H3PO4(aq)+ NH3(aq)+NaCl(aq)

The conjugate acid base pairs for this equilibrium are ,

NH4+(aq)      NH3(aq) (acid)             (conjugate     base)

H2PO4(aq)     H3PO4(aq)  (base)                 (conjugate     acid)

Given:

The value of dissociation constants Kaand Kb are as follows,

NH4+(Ka)=5

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Find more solutions based on key concepts 