Overview Summary of calculations required. When a solid dissolves in water to form a solution energy changes occur. In t

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Overview Summary of calculations required. When a solid dissolves in water to form a solution energy changes occur. In t

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Overview Summary Of Calculations Required When A Solid Dissolves In Water To Form A Solution Energy Changes Occur In T 1
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Overview Summary of calculations required. When a solid dissolves in water to form a solution energy changes occur. In this experiment you will determine the heats of solution for two substances ammonium nitrate and sodium acetate using a simple styrofoam cup as a calon meter. 1. The total heat of solution can be calculated by determining the amount of heat absorbed or lost by the water during the experiment. This is calculated using the formula QmcHAT Purpose dissolving of ammonium heat Hass of water temperature change • To measure nitrate and of sodium absorbed lost oules) (8) (C) Acetate in water specific heat of experimentally the Water amount of heat absorbed Materials (1/1) or released during the dissolved) A calculation table (next page) may be used to work through the required calculations The specific heat of water is more or less a constant with a value of 4 18 J/gXIC styrofoam cup balance

Sample Data Use the following sample data if you are not able to perform the experiment. Ammonium sodium acetate nitrate NH.NO, CH3CO,Na Mass of cup + water (g) 100.69 10349 Mass of empty cup (9) 1.6 g 169 Mass of water (9) Mass of solid + container (g) 53.99 38.49 Mass of empty container (9) 23.39 23.29 Mass of solid used (9) Initial water temperature ("C) 20.2°C 19.8°C Final Water temperature (°C) 8.0°C 27.6 G Change in water temperature (°C)

ammonium nitrate NH.NO, sodium acetate CH3CO Na 1. Total mass of water used (from Table 1) 99 grams 101.8 grams 2. Change in water temperature (from Table 1) 30.6 grams 15.2 grams 3. Specific heat of water 4.18 J/gX1°C 4.18 J/g[x]° -5048.60 3319.08 4. Energy absorbed/lost by the water (I) (see formula 1 9=mcat 5048,60 3319.08 5. Energy absorbed ost by the solute () (same value, but opposite sign, as in calculation step 4] 6. Energy absorbed/lost (kJ) convertinto KOI 5.048 3.319 7 Molar mass of solute (g/mol) 80 82

6. Energy absorbed/lost (kJ) [convert j into kj] 5.048 43.319 7. Molar mass of solute (g/mol) 80 82 8. Moles of solute actually used (mol) 0.3825 0.1853 13.19 9. Molar heat of solution (kJ/mol [see formula 2) 17.91

الا 3 Questions (example: sodium chloride, NaCl, consists of Na and Clions) ammonium nitrate, NH4NO3 1. Both of the substances used in this experiment consist of ions. Give the chemical formulas of the two ions that make up each of the compounds used in this experiment: sodium acetate, CH CO Na write it on the appropriate side of the equation, and give the value for this term that you obtained during your experiment.

Sodium acetal ammonium nitrate, NH.NO3: 3. Write balanced equations for the dissociation of each ionic compound. Include both the physical states of all participants (s. 1. g, a) and the energy term. For the energy term - be sure to sodium acetate, CH, CO Na: 4. The percentage error, E, is a way to measure the accuracy of your experimental work. Percent error is calculated as follows: E Expected 100% where: observed = value you obtained during your experiment expected = actual or expected value

Using the data obtained from your experiment and the following actual values for molar heats of solution, calculate your percentage errors for this experiment. Observed Value Expected Value Percentage Error ammonium nitrate +25.8 kJ/mol sodium acetate -17 4 kJ/mol
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