Neutralization Examples: 47 Problems with Answers

Start with the recap, study the fully worked examples, then use the practice problems to check your understanding of Neutralization.

This page combines explanation, solved examples, and follow-up practice so you can move from recognition to confident problem-solving in Chemistry.

Concept Recap

A chemical reaction in which an acid and a base combine to produce water and an ionic compound called a salt, effectively canceling out the acidic and basic properties of the reactants (e.g., $\text{HCl} + \text{NaOH} \to \text{NaCl} + \text{H}_2\text{O}$ ).

Acid + Base → they cancel each other out, making water and salt.

Read the full concept explanation →

How to Use These Examples

Read the first worked example with the solution open so the structure is clear.
Try the practice problems before revealing each solution.
Use the related concepts and background knowledge badges if you feel stuck.

What to Focus On

Core idea: Neutralization starts by identifying the acid/base species, ions produced or transferred, and pH evidence.

Common stuck point: Students often know a formula related to neutralization but skip the recognition step: Am I tracking acid/base identity, pH, ions in solution, neutralization, buffer behavior, or salt formation? That leads to a correct-looking substitution attached to the wrong chemical model.

Sense of Study hint: Ask: Am I tracking acid/base identity, pH, ions in solution, neutralization, buffer behavior, or salt formation?

Common Mistakes to Watch For

Before you work through the examples, skim the mistake guide so you know which shortcuts and sign errors to avoid.

pH Mistakes

Worked Examples

Example 1

easy

Write the balanced equation for the neutralization of hydrochloric acid with sodium hydroxide.

HCl + NaOH neutralization: acid + base → salt + water

Answer

HCl + NaOH \to NaCl + H_{2} O

First step

Neutralization: acid + base → salt + water.

Full solution

2
$\text{HCl} + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O}$ .
3
Check: Na 1=1, Cl 1=1, H 2=2, O 1=1. Already balanced.

Neutralization reactions combine

\text{H}^+

from the acid with

\text{OH}^-

from the base to form water. The remaining ions form an ionic salt.

Example 2

medium

How many mL of

0.50\,\text{M NaOH}

are needed to neutralize

25\,\text{mL}

0.30\,\text{M HCl}

Example 3

medium

What volume of

0.20\,\text{M}

NaOH neutralizes

30.0\,\text{mL}

0.10\,\text{M}

HCl?

Example 4

medium

25.0\,\text{mL}

0.150\,\text{M}

HCl is titrated with

0.100\,\text{M}

NaOH. What volume of NaOH is required?

Example 5

medium

40.0\,\text{mL}

0.200\,\text{M}

HCl is mixed with

40.0\,\text{mL}

0.100\,\text{M}

NaOH. Which is in excess, and by how many moles?

Example 6

hard

What mass of

\text{Mg(OH)}_2

neutralizes

50.0\,\text{mL}

0.500\,\text{M}

HCl? (

M_{\text{Mg(OH)}_2} = 58.3\,\text{g/mol}

)

Example 7

hard

10.0\,\text{g}

\text{CaCO}_3

reacts with excess HCl. How many moles of HCl are needed to fully neutralize the carbonate? (

M = 100\,\text{g/mol}

)

Practice Problems

Try these problems on your own first, then open the solution to compare your method.

Example 1

easy

Write the neutralization reaction between sulfuric acid (

\text{H}_2\text{SO}_4

) and potassium hydroxide (

\text{KOH}

Diprotic acid H₂SO₄ needs 2 mol KOH for complete neutralization

Example 2

medium

Hydrogen ions from an acid react with hydroxide ions from a base. What substance do those ions form together?

Example 3

easy

Complete the general word equation: acid

+

base

\rightarrow

____

+

____.

Example 4

easy

\text{HCl}+\text{NaOH}\rightarrow\text{NaCl}+\text{H}_2\text{O}

, name the salt formed.

Example 5

easy

What neutral molecule always forms when

\text{H}^+

meets

\text{OH}^-

Example 6

easy

\text{HCl}+\text{NaOH}\rightarrow\text{NaCl}+\text{H}_2\text{O}

balanced?

Example 7

easy

Does a strong acid

+

strong base neutralization (equal moles) give a pH near 7?

Strong acid + strong base in equal moles: the equivalence point lands at neutral pH 7

Example 8

easy

Name the acid and base needed to make the salt

\text{KCl}

by neutralization.

Example 9

easy

In neutralization, which ion comes from the base in the salt?

Example 10

easy

Balance:

\text{H}_2\text{SO}_4+\text{NaOH}\rightarrow\text{Na}_2\text{SO}_4+\text{H}_2\text{O}

Balance the equation: supply the missing coefficients for NaOH and H₂O

Example 11

medium

25\,\text{mL}

of HCl is neutralized by

25\,\text{mL}

0.10\,\text{M}

NaOH. Find the HCl concentration.

Example 12

medium

Does weak acid

+

strong base (e.g. acetic acid

+

NaOH) at equivalence give pH above, below, or equal to 7?

Weak acid + strong base equivalence point falls above pH 7 (basic region)

Example 13

medium

How many moles of NaOH neutralize

0.20\,\text{mol}

\text{H}_2\text{SO}_4

Example 14

medium

Write the balanced equation for neutralizing nitric acid with calcium hydroxide.

Example 15

medium

20\,\text{mL}

0.50\,\text{M}

HCl reacts with

0.50\,\text{M}

NaOH. What volume of NaOH neutralizes it?

Example 16

medium

Why is the salt from strong acid

+

weak base (e.g. NH4Cl) acidic?

Example 17

medium

\text{HCl}+\text{NaOH}

, write the net ionic equation.

Example 18

medium

Write the balanced equation for sulfuric acid neutralizing potassium hydroxide.

Example 19

medium

40\,\text{mL}

0.25\,\text{M}

NaOH neutralizes HCl. How many moles of HCl react?

Example 20

challenge

30.0\,\text{mL}

of HCl is fully neutralized by

20.0\,\text{mL}

0.150\,\text{M}

NaOH. Find the HCl concentration.

Example 21

challenge

25.0\,\text{mL}

0.200\,\text{M}

\text{H}_2\text{SO}_4

is titrated with

0.100\,\text{M}

NaOH. What volume of NaOH is needed?

Example 22

challenge

After mixing

0.0100\,\text{mol}

HCl with

0.0060\,\text{mol}

NaOH in

0.500\,\text{L}

, find the pH (strong acid/base).

Example 23

easy

Write the balanced equation for the neutralization of

\text{HNO}_3

with KOH.

Example 24

easy

Name the salt produced by

\text{HCl} + \text{KOH}

Example 25

easy

Write the balanced equation for neutralizing

\text{HBr}

with

\text{NaOH}

Example 26

easy

Does

\text{HCl} + \text{Mg(OH)}_2

neutralization need a 1:1 mole ratio?

Example 27

medium

How many moles of NaOH are needed to neutralize

0.50\,\text{mol}

\text{H}_3\text{PO}_4

fully?

Example 28

medium

Write the balanced equation for neutralizing

\text{H}_2\text{SO}_4

with

\text{Ca(OH)}_2

Example 29

medium

After complete neutralization of

0.10\,\text{mol}

HCl with

0.10\,\text{mol}

_3

, will the resulting NH

_4

Cl solution be acidic, basic, or neutral?

NH₄Cl (strong acid + weak base salt) hydrolyzes to give an acidic solution with pH < 7

Example 30

medium

How many milliliters of

0.250\,\text{M}

\text{H}_2\text{SO}_4

neutralize

50.0\,\text{mL}

0.500\,\text{M}

NaOH?

Example 31

medium

What kind of salt (acidic/basic/neutral) is

\text{CH}_3\text{COONa}

in water?

Example 32

medium

Calculate the molarity of HCl if

25.00\,\text{mL}

is neutralized by

32.50\,\text{mL}

0.100\,\text{M}

NaOH.

Example 33

medium

Write the net ionic equation for the neutralization

\text{HClO}_4 + \text{LiOH} \rightarrow \text{LiClO}_4 + \text{H}_2\text{O}

Example 34

hard

30.0\,\text{mL}

0.250\,\text{M}

HCl is mixed with

20.0\,\text{mL}

0.500\,\text{M}

NaOH. Find the pH of the final solution (assume volumes additive).

Example 35

hard

0.0150\,\text{mol}

HCl reacts with

0.0150\,\text{mol}

_3

250\,\text{mL}

water. Estimate whether final pH is above, below, or equal to 7.

Example 36

hard

25.0\,\text{mL}

sample of

\text{H}_2\text{SO}_4

requires

20.0\,\text{mL}

0.500\,\text{M}

KOH for complete neutralization. Find the H

_2

_4

molarity.

Example 37

hard

After mixing

0.0200\,\text{mol}

HNO

_3

with

0.0200\,\text{mol}

NaOH in

1.00\,\text{L}

water, find the pH.

0.0200 mol HNO₃ + 0.0200 mol NaOH: equal moles of strong acid and strong base neutralize to pH

Example 38

hard

Write the balanced equation for neutralizing

\text{H}_3\text{PO}_4

with

\text{NaOH}

to give

\text{Na}_3\text{PO}_4

Example 39

hard

A student titrates an unknown HCl with

0.100\,\text{M}

NaOH. If

30.0\,\text{mL}

acid needs

24.0\,\text{mL}

base, find the HCl concentration.

Example 40

challenge

100\,\text{mL}

0.100\,\text{M}

HCl is mixed with

100\,\text{mL}

0.0500\,\text{M}

Ba(OH)

_2

. Find the pH of the resulting solution.

← Back to Neutralization Common Mistakes Practice Mode

Related Concepts

Acid Base Salt Titration

Background Knowledge

These ideas may be useful before you work through the harder examples.

acidbase