Each row of the table below describes an aqueous solution at 25°C . The second c
ID: 560217 • Letter: E
Question
Each row of the table below describes an aqueous solution at
25°C
.
The second column of the table shows the initial components of the solution.
Use the checkboxes in the third column to explain the type of the initial solution.
The fourth column describes a change in the solution.
a @ 8 68% [4] Tue Nov 14 1:16 AM = Od á Mail - zigmathrmacmich.edu Presentation.pptx Hannah · Safari File Edit View History Bookmarks Window Help ... 0 O 9 www-awh.aleks.com DA OG ALEKS - Learn - Hannah Zigman Chegg Study | Guided Solutions and St.. Syllabus - CHM 132 - Fall 2017 O ACIDS, BASES AND AQUEOUS EQUILIBRIA Making qualitative estimates of pH change CTC, e taule verow desudes all aqueous sororo de 2. t. The second column of the table shows the initial components of the solution. • Use the checkboxes in the third column to explain the type of the initial solution. The fourth column describes a change in the solution. • Use the fifth column to predict how the change in the solution will change its pH. @00 change add HCl add K Br initial type solution initial components (check all that apply) O acidic H,0 o basic o neutral O acidic H,0, HBr O basic O neutral O acidic H,0, HBr o basic O neutral O acidic H,0 o basic a neutral effect of change on pH (check one) O pH higher O pH lower O pH the same O pH higher O pH lower O pH the same O pH higher O pH lower O pH the same O pH higher O pH lower O pH the same add KOH add NaCl n ? Explanation Check 2017 McGraw Hill Education. NI Rights Reserved. Terms of Use | Privacy NON 99 OCASI 10 @ % AO = wg P9 I 14Explanation / Answer
Initial Components
Initial Type
Change
Effect of change on pH
A
H2O
Neutral
Add HCl
HCl is acidic and hence, lowers the pH of the solution. This is due to the fact that HCl ionizes completely in H2O to produce H+. The higher the H+ concentration, the lower is the pH of the solution.
B
H2O, HBr
Acidic (HBr is a strong acid)
Add KBr
KBr is a neutral salt and ionizes in water; however, no extra H+ is produced due to the ionization and hence, the pH remains the same.
C
H2O, HBr
Acidic (HBr is a strong acid)
Add KOH
KOH reacts with HBr to form a neutral salt, KBr and H2O (also neutral). The pH must therefore increases, since the H+ from HBr combines with OH- to form neutral H2O. Lowering the H+ concentration increases the pH of the solution.
D
H2O
Neutral
Add NaCl
NaCl is a neutral salt and doesn’t affect the pH of the solution. Hence, the pH remains the same.
Solution
Initial Components
Initial Type
Change
Effect of change on pH
A
H2O
Neutral
Add HCl
HCl is acidic and hence, lowers the pH of the solution. This is due to the fact that HCl ionizes completely in H2O to produce H+. The higher the H+ concentration, the lower is the pH of the solution.
B
H2O, HBr
Acidic (HBr is a strong acid)
Add KBr
KBr is a neutral salt and ionizes in water; however, no extra H+ is produced due to the ionization and hence, the pH remains the same.
C
H2O, HBr
Acidic (HBr is a strong acid)
Add KOH
KOH reacts with HBr to form a neutral salt, KBr and H2O (also neutral). The pH must therefore increases, since the H+ from HBr combines with OH- to form neutral H2O. Lowering the H+ concentration increases the pH of the solution.
D
H2O
Neutral
Add NaCl
NaCl is a neutral salt and doesn’t affect the pH of the solution. Hence, the pH remains the same.
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