Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 15: Problem 89

\(\mathrm{Zn}(\mathrm{OH})_{2}\) is an amphoteric hydroxide. Write balanced ionic equations to show its reaction with (a) \(\mathrm{HCl},\) (b) \(\mathrm{NaOH}\) [the product is \(\left.\mathrm{Zn}(\mathrm{OH})_{4}^{2-}\right]\).

Short Answer

Expert verified
The net ionic equations for the reactions are: \(\mathrm{H^+} + \mathrm{OH^-}\rightarrow \mathrm{H}_{2}\mathrm{O}\) (for the reaction with \(\mathrm{HCl}\)) and \(\mathrm{Zn^{2+}} + 4\mathrm{OH^-}\rightarrow \mathrm{Zn}(\mathrm{OH})_{4}^{2-}\) (for the reaction with \(\mathrm{NaOH}\))

Step by step solution

01

Reaction with HCl

Write the balanced equation for the reaction of zinc hydroxide with hydrochloric acid: \(\mathrm{Zn}(\mathrm{OH})_{2} + 2\mathrm{HCl}\rightarrow \mathrm{ZnCl}_{2} + 2\mathrm{H}_{2}\mathrm{O}\). This is a typical acid-base reaction, with zinc hydroxide acting as a base.
02

Write the ionic equation for the reaction with HCl

Now break the compounds into their ions to write the ionic equation: \(\mathrm{Zn^{2+}} + 2\mathrm{OH^-} + 2\mathrm{H^+} + 2\mathrm{Cl^-}\rightarrow \mathrm{Zn^{2+}} + 2\mathrm{Cl^-} + 2\mathrm{H}_{2}\mathrm{O}\). Note that \(\mathrm{Zn^{2+}}\) and \(\mathrm{Cl^-}\) appear on both sides, so these are spectator ions that can be removed from the ionic equation.
03

Simplify the ionic equation for the reaction with HCl

Take out the spectator ions to get the net ionic equation: \(2\mathrm{H^+} + 2\mathrm{OH^-}\rightarrow 2\mathrm{H}_{2}\mathrm{O}\). This can be simplified to \(\mathrm{H^+} + \mathrm{OH^-}\rightarrow \mathrm{H}_{2}\mathrm{O}\).
04

Reaction with NaOH

Write the balanced equation for the reaction of zinc hydroxide with sodium hydroxide: \(\mathrm{Zn}(\mathrm{OH})_{2} + 2\mathrm{NaOH}\rightarrow \mathrm{Na}_{2}\mathrm{Zn}(\mathrm{OH})_{4}\). This is a typical acid-base reaction, but here zinc hydroxide acts as an acid.
05

Write the ionic equation for the reaction with NaOH

Break the compounds into their ions to write the ionic equation: \(\mathrm{Zn^{2+}} + 2\mathrm{OH^-} + 2\mathrm{Na^+} + 2\mathrm{OH^-}\rightarrow 2\mathrm{Na^+} + \mathrm{Zn}(\mathrm{OH})_{4}^{2-}\). Here, \(\mathrm{Na^+}\) is a spectator ion and can be eliminated from the equation.
06

Simplify the ionic equation for the reaction with NaOH

Take out the spectator ions to get the net ionic equation: \(\mathrm{Zn^{2+}} + 4\mathrm{OH^-}\rightarrow \mathrm{Zn}(\mathrm{OH})_{4}^{2-}\). This equation can't be simplified further, because it is already balanced.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

What is the \(\mathrm{pH}\) of \(250.0 \mathrm{~mL}\) of an aqueous solution containing \(0.616 \mathrm{~g}\) of the strong acid trifluoromethane sulfonic acid (CF \(_{3} \mathrm{SO}_{3} \mathrm{H}\) )?

Calculate the \(\mathrm{pH}\) of a \(0.42 \mathrm{M} \mathrm{NH}_{4} \mathrm{Cl}\) solution.

Which of the following statements is/are true regarding a \(1.0 M\) solution of a strong acid HA? (a) \(\left[\mathrm{A}^{-}\right]>\left[\mathrm{H}^{+}\right]\) (b) The pH is 0.00 . (c) \(\left[\mathrm{H}^{+}\right]=1.0 M\) (d) \([\mathrm{HA}]=1.0 \mathrm{M}\)

Write all the species (except water) that are present in a phosphoric acid solution. Indicate which species can act as a Brønsted acid, which as a Brønsted base, and which as both a Brønsted acid and a Brønsted base.

List the factors on which the \(K_{\mathrm{a}}\) of a weak acid depends.
See all solutions

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Read Explanation

Chemistry Branches

Read Explanation

Organic Chemistry

Read Explanation

Chemical Analysis

Read Explanation

Nuclear Chemistry

Read Explanation

Inorganic Chemistry

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free