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Chemistry
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Chemistry
Quiz 8: Aqueous Solutions-Chemistry of the Hydrosphere
Path 4
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Question 181
Essay
Arsenic,which is toxic,can be removed from drinking water by precipitation as the sulfide.Write the net ionic equation for the precipitation of As
3+
using sodium sulfide,Na
2
S.
Question 182
Essay
Identify the acid and the base in the following reaction: 2 NH
3
(aq)+ H
2
SO
4
(aq)
→
\to
→
2 NH
4
+
(aq)+ SO
4
2
-
(aq)
Question 183
Essay
Dolomite can be used as an ornamental stone,a concrete aggregate,and a source of magnesium oxide.Its chemical formula can be written as CaMg(CO
3
)
2
.Write the molecular and net ionic equations for the complete reaction of dolomite with concentrated hydrochloric acid.
Question 184
Essay
The bicarbonate ion,HCO
3
-
,can act as an acid or as a base.Write the reactions with water that show this behavior.
Question 185
Essay
Outline a method that could be used to separate aqueous silver,chromium(III),and potassium ions from one another by precipitation.You many use any reagent that does not already contain one or more of these ions.