The following analysis has been obtained for a lake water sample. Please indicate the alkalinity (a), total hardness (b), carbonate (c) and non-carbonate hardness (d) for this sample. Is this water hard (type: 1 for YES, 2 for NO) (e)? Also, estimate the percent reliability of the analysis (f). Answers a, b, c, and d in units of mg/L CaCO3. All answers with 3 significant digits, except for (e). (Tip: use %diff=((X-Y)/(X+Y))*100) lons in solution Concentration (mmol/L) Molecular mass (mg/mmole) 0.567 96.1 0.006 60.0 1.561 35.5 NO 0.567 62.0 HCO, 2.674 61.0 Na 0.94 23.0 K* 1.221 39.1 Ca2+ 2.043 40.1 Mg2+ Zn2- 1.322 24.3 0.045 65.4 a) : b) ; d) ; e) ; f)

Structural Analysis
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### Lake Water Sample Analysis

The following analysis has been conducted on a lake water sample. Please provide the values for alkalinity (a), total hardness (b), carbonate (c), and non-carbonate hardness (d) for this sample.

- **Is this water hard?**  
  Type "1" for YES and "2" for NO (e).

- **Estimate the percent reliability of the analysis** (f).

**Instructions:** Answers for a, b, c, and d should be in units of mg/L CaCO3. Provide all answers with three significant digits, except for (e).

**Tip:** Use the formula %diff = ((X-Y)/((X+Y)/2)) * 100 for calculations.

#### Table: Ions in Solution

| Ions in Solution | Concentration (mmol/L) | Molecular Mass (mg/mmole) |
|-------------------|-------------------------|-----------------------------|
| SO₄²⁻             | 0.567                   | 96.1                        |
| CO₃²⁻             | 0.006                   | 60.0                        |
| Cl⁻               | 1.561                   | 35.5                        |
| NO₃⁻              | 0.567                   | 62.0                        |
| HCO₃⁻             | 2.674                   | 61.0                        |
| Na⁺               | 0.944                   | 23.0                        |
| K⁺                | 1.221                   | 39.1                        |
| Ca²⁺              | 2.043                   | 40.1                        |
| Mg²⁺              | 1.322                   | 24.3                        |
| Zn²⁺              | 0.045                   | 65.4                        |

**Answer Fields:**

- a) [__]  
- b) [__]  
- c) [__]  
- d) [__]  
- e) [__]  
- f) [__]  

Please ensure all calculations and corresponding answers are completed accurately for comprehensive analysis.
Transcribed Image Text:### Lake Water Sample Analysis The following analysis has been conducted on a lake water sample. Please provide the values for alkalinity (a), total hardness (b), carbonate (c), and non-carbonate hardness (d) for this sample. - **Is this water hard?** Type "1" for YES and "2" for NO (e). - **Estimate the percent reliability of the analysis** (f). **Instructions:** Answers for a, b, c, and d should be in units of mg/L CaCO3. Provide all answers with three significant digits, except for (e). **Tip:** Use the formula %diff = ((X-Y)/((X+Y)/2)) * 100 for calculations. #### Table: Ions in Solution | Ions in Solution | Concentration (mmol/L) | Molecular Mass (mg/mmole) | |-------------------|-------------------------|-----------------------------| | SO₄²⁻ | 0.567 | 96.1 | | CO₃²⁻ | 0.006 | 60.0 | | Cl⁻ | 1.561 | 35.5 | | NO₃⁻ | 0.567 | 62.0 | | HCO₃⁻ | 2.674 | 61.0 | | Na⁺ | 0.944 | 23.0 | | K⁺ | 1.221 | 39.1 | | Ca²⁺ | 2.043 | 40.1 | | Mg²⁺ | 1.322 | 24.3 | | Zn²⁺ | 0.045 | 65.4 | **Answer Fields:** - a) [__] - b) [__] - c) [__] - d) [__] - e) [__] - f) [__] Please ensure all calculations and corresponding answers are completed accurately for comprehensive analysis.
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