9.
Which of the following graphs shows the
change in pH when zinc carbonate is added to
hydrochloric acid until it is in excess?
(a) pH
7+
(b) pH
7+
25
0
0
Mass of ZnCO3 -->
added
Mass of ZnCO3 -->
added
1146
Wres
PH
pH
7+
(c)
7+
(d)
0
0
Mass of ZnCO3 -->
added
Mass of ZnCO3 ->
added
Answers
Answer:
your question is not clear enough...
Given: (a) PH 7+
(b) PH 7+
25,0 ,0
Mass of ZnCO3 -->
added
Mass of ZnCO3 -->
added
PH 7+
(c) PH 7+
(d)
0
0
Mass of ZnCO3 -->
added
Mass of ZnCO3 ->
added
To Find: change in pH when zinc carbonate is added to
hydrochloric acid until it is in excess
Solution:
Without a visual aid, it's difficult to determine which graph shows the change in pH when zinc carbonate is added to hydrochloric acid until it is in excess.
Zinc carbonate reacts with hydrochloric acid to form zinc chloride, water, and carbon dioxide gas. The balanced chemical equation for the reaction is:
ZnCO3(s) + 2HCl(aq) → ZnCl2(aq) + H2O(l) + CO2(g)
As the reaction proceeds, hydrochloric acid is consumed, which should lead to a decrease in pH.
The exact shape of the pH vs. mass of the ZnCO3 added graph would depend on the specific experimental conditions and the accuracy of the pH measurements.
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