[Instruction]
Please act as an impartial judge and evaluate the quality of the response provided by an AI assistant to the user question displayed below. Your evaluation should consider factors such as the helpfulness, relevance, accuracy, depth, creativity, and level of detail of the response. Begin your evaluation by providing a short explanation. Be as objective as possible. After providing your explanation, you must rate the response on a scale of 1 to 10 by strictly following this format: "[[rating]]", for example: "Rating: [[5]]".

[Question]
Describe the process and write out the balanced chemical equation for the reaction that occurs when solid calcium carbonate reacts with hydrochloric acid to form aqueous calcium chloride, carbon dioxide, and water. What type of reaction is this, and what observations might indicate that the reaction is taking place?

[The Start of Assistant's Answer]


1. Write out the process in an equation with words, as shown in the example.
2. Write out the balanced stoichiometric equation with the correct formulas. Then classify the reaction. Does this example fit any named category, such as, precipitation or redox?
3. As part of your overview, mention any evidence that the reaction is taking place, such as bubbles of carbon dioxide gas.

Strategy:

Memorizing the process first, and then writing that down in the original equation. Predicting and correcting the final balanced equation.

#### Solution

1. When solid calcium carbonate reacts with hydrochloric acid, aqueous calcium chloride, carbon dioxide, and water are formed. This be represented by a word equation:
solid calcium carbonate + hydrochloric acid --> aqueous calcium chloride + carbon dioxide + water

##### Reaction Type

Calcium chloride is soluble in water, so it should not be a precipitation reaction. Because carbon appears on both sides of the equation, this reaction is not a redox reaction. Since water is formed, it could be a hydrolysis reaction. Hydrochloride acid is a strong acid and calcium carbonate is a base, so this reaction is an acid-base reaction.

Bubbles of carbon dioxide might be produced in this reaction, and that could be a possible observation indicating that the reaction is occurring.

##### Stoichiometric Coefficients

In order to balance stoichiometric coefficients, the equation is first re-written like this:

CaCO3 + HCl --> CaCl2 + CO2 + H2O

The sums of each element on the left and right sides are found:
calcium = 1 (left) = 1 (right)
carbon = 1 (left) = 1 (right)
hydrogen = 1 (left) = 2 (right)
oxygen = 3 (left) = 3 (right)
chlorine = 1 (left) = 2 (right)

All numbers match, except for hydrogen and chlorine. The stoichiometric coefficient of HCl is adjusted so that hydrogen and chlorine balance.

CaCO3 + 2HCl --> CaCl2 + CO2 + H2O

##### Predicting and Correcting the Final Equation

This equation should be original process described in words.
CaCO3 + 2HCl --> CaCl2 + CO2 + H2O

This equation is balanced and is correct.

##### Reaction Verification

The strategy used in solving this question is:

1. Describe the process in a word equation.
2. Write a molecular equation from the word equation.
3. Finalize the molecular equation by balancing all of the stoichiometric coefficients.

###### Questions to Ask Yourself
• Are the equation in words and the molecular equation consistent?
• Are all of the equations balanced?

### Example 2: Balance a Reaction Equation

#### Problem

Sodium sulfate reacts with calcium chloride to form sodium chloride and calcium sulfate.

Calculate the stoichiometric coefficients so that the reaction is balanced.

Strategy:

The key to balancing reactions is the going back and forth from the different available forms of the reaction.

###### Solution

The strategy used in solving this question is:

1. Describe the word equation in exact terms from the given process
2. Calculate stoichiometric coefficients for the molecular equation.

###### Step 1

The provided word equation is a redox reaction where both sides of the reaction are aqueous:

Sodium sulfate reacts with calcium chloride to form sodium chloride and calcium sulfate.

Na2SO4 + CaCl2 --> CaSO4 + NaCl

###### Step 2

Calculate the stoichiometric coefficients given the molecular equation.

The molecular equation for the reaction is:

Na2SO4 + CaCl2 --> CaSO4 + NaCl

If the coefficients are calculated, then the equation becomes:

$${2Na_2SO_4(aq) + CaCl_2(aq) \rightarrow CaSO_{4}(aq) + 2NaCl(aq)}$$

##### Reaction Verification

Verify that all of the stoichiometric coefficients are balanced.

The strategy used in solving this question is:

1. Describe the word equation in exact terms from the given process
2. Calculate stoichiometric coefficients        for the molecular equation
##### Practice Questions

Question 1

Where no notes are given, you are making a clear liquid solution by adding solid calcium nitrate to deionized water. I've provided enough notes to unambiguously describe the reactants but not the products. Choose a proper equation and explain your reasoning.

✌️When the notes just say that
[The End of Assistant's Answer]