A precipitate will be formed when an aqueous carbonic acid soution is added to what other aqueous solution?

A. ammonium chloride
B. calcium hydroxide
C. Sodium Chloride
D. Potassium carbonate
E. Nitrous acid

Well, let me think... Ah, I've got it! The answer is B. Calcium hydroxide. When you mix an aqueous carbonic acid solution with calcium hydroxide, it forms a lovely little precipitate. It's like a chemistry magic trick! Poof, there it is!

To determine which aqueous solution will form a precipitate with an aqueous carbonic acid solution, we need to identify any possible reactions that could produce an insoluble compound.

The formula for carbonic acid is H2CO3. When it dissociates in water, it forms two hydrogen ions (H+) and one carbonate ion (CO3^2-).

Let's consider the options one by one:

A. Ammonium chloride (NH4Cl) contains ammonium ions (NH4+) and chloride ions (Cl-). There is no possible reaction between NH4+ and CO3^2- that will form an insoluble compound. Therefore, no precipitate will form.

B. Calcium hydroxide (Ca(OH)2) contains calcium ions (Ca^2+) and hydroxide ions (OH-). When carbonic acid is added to calcium hydroxide, a double replacement reaction occurs, forming calcium carbonate (CaCO3) and water (H2O). Calcium carbonate is insoluble, so a precipitate will be formed.

C. Sodium chloride (NaCl) contains sodium ions (Na+) and chloride ions (Cl-). There is no possible reaction between Na+ and CO3^2- that will form an insoluble compound. Therefore, no precipitate will form.

D. Potassium carbonate (K2CO3) contains potassium ions (K+) and carbonate ions (CO3^2-). When carbonic acid is added to potassium carbonate, a double replacement reaction occurs, forming potassium bicarbonate (KHCO3). Potassium bicarbonate is soluble, so no precipitate will form.

E. Nitrous acid (HNO2) does not contain any ions that can react with the ions from carbonic acid. Therefore, no precipitate will form.

Based on this analysis, the correct answer is B. Calcium hydroxide.

To determine which aqueous solution will form a precipitate when added to an aqueous carbonic acid solution, we need to refer to solubility rules and reactions of the compounds involved.

In this case, we are looking for a reaction that forms an insoluble compound, which will result in the formation of a precipitate. Based on solubility rules, let's analyze each option:

A. Ammonium chloride (NH4Cl): The combination of ammonium chloride and carbonic acid does not yield an insoluble compound, so no precipitate will form.

B. Calcium hydroxide (Ca(OH)2): When calcium hydroxide reacts with carbonic acid, calcium carbonate (CaCO3) is formed, which is insoluble, so a precipitate will form.

C. Sodium chloride (NaCl): The combination of sodium chloride and carbonic acid does not yield an insoluble compound, so no precipitate will form.

D. Potassium carbonate (K2CO3): Since potassium carbonate is a carbonate, combining it with carbonic acid will not form a precipitate. Instead, it will yield a double displacement reaction, resulting in the formation of water and carbon dioxide.

E. Nitrous acid (HNO2): Nitrous acid does not react with carbonic acid to form an insoluble compound, so no precipitate will form.

Therefore, the correct answer is B. Calcium hydroxide, as it will form a precipitate (calcium carbonate) when added to an aqueous carbonic acid solution.

The solubility rules will tell you the answer. You look for the formation of an insoluble material.

http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html