
To determine:
a. The net ionic equation for the reaction of each of the given bases with aqueous
b. How substances sparingly soluble in water can act as effective antacids.

Answer to Problem 15.144QA
Solution:
a)
b) The reaction of stomach acid with sparingly soluble substances causes only a small amount of the substance to dissolve and act as antacid.
Explanation of Solution
Aqueous
a) Write the net ionic reaction for the given salts and HCl from total ionic reaction.
i) Reaction of
It is given that
Total ionic equation:
Net ionic equation:
ii) Reaction of
Total ionic equation:
Net ionic equation:
iii) Reaction of
Total ionic equation:
Net ionic equation:
iv) Reaction of
Total ionic equation:
Net ionic equation:
b) Sparingly soluble substances do not dissociate in solution to a large extent.
For example:
When this salt reacts with the stomach acid, the
Hence, sparingly water soluble salts can act as effective antacids.
Conclusion:
The net ionic equation is written by writing the complete molecular and total ionic equations and cancelling out the spectator ions. A small portion of the sparingly soluble substance dissolves to neutralize the stomach acid and hence acts as an effective antacid.
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Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach
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