n student worker in the Cal Poly chemistry stockroom is asked to determine the concentration of an aqueous solution of Ca(OH); by titration with an aqueous HNO, standard. Given that the student started with 16.4 mL of Ca(OH); and reached the end point with 0.9021 mL. of the HNO, 20.9 M standard, what is the concentration of the Ca(OH)2 solution? Report your answer to THREE decimal places. Type your answer.

Suppose that you are performing a titration of a hydrochloric acid solution of unknown concentration using a standardized solution of 0.063 M Ca(OH)₂. You prepare the analyte solution by adding 10.0 mL of the unknown hydrochloric acid solution, 40.0 mL of water, and 2 drops of phenolphthalein to an Erlenmeyer flask. You discover that it takes 37.05 mL of Ca(OH)₂ to reach the end point. What is the concentration of the unknown HCl solution? HCl concentration: M

The nitrogen and protein content of a 0.757 g sample of flour sample was analyzed using Kjeldahl analysis. After digestion, the liberated NH3 was distilled in a flask containing boric acid. Titration requires 12.45 mL of standard 0.100 M HCI to reach the desired endpoint. Calculate the weight percent of protein in the sample of flour considering that there is 14.76 g N per 100g protein.

25. A 25 mL sample of Ca(OH)2 was analyzed with a 0.10 M HCl standard. If 30 mL of the acid standard were consumed during the titration, determine the grams of calcium hydroxide Ca(OH)2 present. in the sample. Ca(OH)2(aq) + 2 HCl(aq) → CaCl2(aq) + 2 H2O(l) What is the molarity of the calcium hydroxide solution, Ca(OH)2? A) 0.05 B) 0.50 C) 0.06 D) 0.40 E) 0.34