Pre-Laboratory Assignment ePPhpriate reference such as TECH 349, Standard ini Hy

Question

Pre-Laboratory Assignment ePPhpriate reference such as TECH 349, Standard ini Hydrochloric Acid solution a ng appropriate reference, such as TECH 322. Laboratory Mass M easurements, for a d iscunsion of mass measurement 2. nrieny hy it in advi ble to eover beaker containing NI NHCI buffer solution when 3, A student analyzed powdered cultured buttermilk in this A 227o using the proced experiment. ure of the powdered buttermilk required 37.18 mL of solution for titration 83 x 10 M EDTA, of the Ca ion. a) How many moles of Ca2. ion were present in the sample? 02) How many grams of Ca ion did the titrated sample contain? What is the mass percent Ca ion in the milk powder?

Explanation / Answer

2. The buffer NH3-NH4+ is asked to be covered when not in use as NH3 may leave from the solution and thus would change the concentration and the pH of the buffer.

3. Milk powder analysis

1) moles Ca2+ present = 1.183 x 10^-2 M 37.18 ml = 0.44 mmol

2) grams of Ca2+ present = 0.0044 mol x 40.078 g/mol = 0.02 g

3) mass% Ca2+ in milk powder = 0.02 x 100/2.270 g = 0.88%

4. Chocolate milk podwer has a ot of additives in it, which would it difficult to analyze the chocolate mild powder for Ca2+ analysis. The additives would interfere in the analysis.

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