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Name Date Section Determination of a Chemical Equation Postlab Questions The procedure of this experiment mentions that absorption of CO, into the NaOH solution can affect the concentration of hydroxide ion. Explain how this may happen. Hint: When carbon dioxide dissolves in water they react to form carbonic acid. 1. In titrations like the ones in this experiment, rinsing the sides of the titration flask with distilled water is often recommended to ensure that all the solute is in the bulk liquid. Why can extra water be added to the flask without adversely affecting the calculations? 2. 3. A Rolaids tablet contains 0.8550 grams of calcium carbonate to neutralize stomach acid. If the acid in your stomach is a 0.5000 M hydrochloric acid solution, what volume of stomach acid is required for neutralization of the tablet? Use the equation below (make sure it is balanced). Caco,(s) + 2 HCI(aq) â CaCla(aq) + H2O) + CO2 (g) 4. Some chemists put a piece of white paper undeneath the Erlenmeyer flask when they are titrating because it is preferable to having the flask on a black lab bench. Why do you think the piece of white paper might be helpful in getting more accurate results? Explain your answer Revised 1/17/17
Name Date Section Determination of a Chemical Equation Postlab Questions The procedure of this experiment mentions that absorption of CO, into the NaOH solution can affect the concentration of hydroxide ion. Explain how this may happen. Hint: When carbon dioxide dissolves in water they react to form carbonic acid. 1. In titrations like the ones in this experiment, rinsing the sides of the titration flask with distilled water is often recommended to ensure that all the solute is in the bulk liquid. Why can extra water be added to the flask without adversely affecting the calculations? 2. 3. A Rolaids tablet contains 0.8550 grams of calcium carbonate to neutralize stomach acid. If the acid in your stomach is a 0.5000 M hydrochloric acid solution, what volume of stomach acid is required for neutralization of the tablet? Use the equation below (make sure it is balanced). Caco,(s) + 2 HCI(aq) â CaCla(aq) + H2O) + CO2 (g) 4. Some chemists put a piece of white paper undeneath the Erlenmeyer flask when they are titrating because it is preferable to having the flask on a black lab bench. Why do you think the piece of white paper might be helpful in getting more accurate results? Explain your answer Revised 1/17/17
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Sixta KovacekLv2
27 Apr 2019
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