30. A student is given 50.0 mL of a solution of Na,CO; of unknown concentration. To determine the concentration of the solution, the student mixes the solution with excess 1.0 M Ca(NO:),(ag), causing a precipitate to form. The balanced equation for the reaction is shown below. NazCOs(ag) + Ca(NO:)2(aq) --------> 2 NaNO:(aq) + CaCO:(s) a) Write the net ionic equation for the reaction that occurs when the solutions of Na,CO; and Ca(NO:); are mixed. b) The diagram below is incomplete. Draw in the species needed to accurately represent the major ionic species remaining in the solution after the reaction has been completed. (Na+ (NO, (NO, (Na (NO, (NO, Solid CaCO3

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The student filters and dries the precipitate of CaCO₃ (molar mass 100.1 g/mol) and records the data in the table below.

| Measured Quantity                    | Value     |
|--------------------------------------|-----------|
| Volume of Na₂CO₃ solution            | 50.0 mL   |
| Volume of 1.0 M Ca(NO₃)₂ added       | 100.0 mL  |
| Mass of CaCO₃ precipitate collected  | 0.93 g    |

c) Determine the number of moles of Na₂CO₃ in the original 50.0 mL of solution.

d) The student realizes that the precipitate was not completely dried and claims that as a result, the calculated Na₂CO₃ molarity is too low. Do you agree with the student's claim? Justify your answer.

After the precipitate forms and is filtered, the liquid that passed through the filter is tested to see if it can conduct electricity. What would be observed? Justify your answer.
Transcribed Image Text:The student filters and dries the precipitate of CaCO₃ (molar mass 100.1 g/mol) and records the data in the table below. | Measured Quantity | Value | |--------------------------------------|-----------| | Volume of Na₂CO₃ solution | 50.0 mL | | Volume of 1.0 M Ca(NO₃)₂ added | 100.0 mL | | Mass of CaCO₃ precipitate collected | 0.93 g | c) Determine the number of moles of Na₂CO₃ in the original 50.0 mL of solution. d) The student realizes that the precipitate was not completely dried and claims that as a result, the calculated Na₂CO₃ molarity is too low. Do you agree with the student's claim? Justify your answer. After the precipitate forms and is filtered, the liquid that passed through the filter is tested to see if it can conduct electricity. What would be observed? Justify your answer.
### Problem 30:

A student is given 50.0 mL of a solution of Na₂CO₃ of unknown concentration. To determine the concentration of the solution, the student mixes the solution with excess 1.0 M Ca(NO₃)₂, causing a precipitate to form. The balanced equation for the reaction is shown below:

\[ \text{Na}_2\text{CO}_3(aq) + \text{Ca(NO}_3)_2(aq) \rightarrow 2 \text{NaNO}_3(aq) + \text{CaCO}_3(s) \]

**a)** Write the net ionic equation for the reaction that occurs when the solutions of Na₂CO₃ and Ca(NO₃)₂ are mixed.

**b)** The diagram below is incomplete. Draw in the species needed to accurately represent the major ionic species remaining in the solution after the reaction has been completed.

### Diagram Explanation:

The diagram shows a beaker with aqueous ions inside and a solid precipitate at the bottom. The following species are depicted:

- **Na⁺ ions**: These are represented as circles labeled "Na⁺."
- **NO₃⁻ ions**: These are represented as circles labeled "NO₃⁻."

The solid at the bottom is labeled "Solid CaCO₃," indicating the precipitate formed in the reaction.

To complete the diagram, ensure that Na⁺ and NO₃⁻ ions are distributed in the solution above the precipitate, representing the dissolved ions after the reaction.
Transcribed Image Text:### Problem 30: A student is given 50.0 mL of a solution of Na₂CO₃ of unknown concentration. To determine the concentration of the solution, the student mixes the solution with excess 1.0 M Ca(NO₃)₂, causing a precipitate to form. The balanced equation for the reaction is shown below: \[ \text{Na}_2\text{CO}_3(aq) + \text{Ca(NO}_3)_2(aq) \rightarrow 2 \text{NaNO}_3(aq) + \text{CaCO}_3(s) \] **a)** Write the net ionic equation for the reaction that occurs when the solutions of Na₂CO₃ and Ca(NO₃)₂ are mixed. **b)** The diagram below is incomplete. Draw in the species needed to accurately represent the major ionic species remaining in the solution after the reaction has been completed. ### Diagram Explanation: The diagram shows a beaker with aqueous ions inside and a solid precipitate at the bottom. The following species are depicted: - **Na⁺ ions**: These are represented as circles labeled "Na⁺." - **NO₃⁻ ions**: These are represented as circles labeled "NO₃⁻." The solid at the bottom is labeled "Solid CaCO₃," indicating the precipitate formed in the reaction. To complete the diagram, ensure that Na⁺ and NO₃⁻ ions are distributed in the solution above the precipitate, representing the dissolved ions after the reaction.
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