A white solid is added to dilute hydrochloric acid, and a gas comes out that turns lime water milky.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A white solid is added to dilute hydrochloric acid, and a gas comes out that turns lime water milky.
- What kind of compound is the solid?
- Write the equation if the solid is calcium carbonate.
- How many moles of the gas come from of calcium carbonate ()?
Need a reminder? The key ideaShow
Acid + metal salt + hydrogen. Acid + carbonate or hydrogencarbonate salt + water + carbon dioxide. Acid + base salt + water. Hydrogen burns with a pop; carbon dioxide turns lime water milky. Metal oxides are basic, non-metal oxides acidic.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The gas is carbon dioxide, so the solid is a carbonate (or a hydrogencarbonate).
Step 2. (b) .
Step 3. (c) of carbonate gives of .
Answer: (a) a carbonate. (c) .
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