please explain clearly the steps to solve 9 and 10. What is hydroxide ion concen
ID: 617263 • Letter: P
Question
please explain clearly the steps to solve 9 and 10.
What is hydroxide ion concentration? You have a solution of 0.15M Ca(OH)z and a solution of HNO3 whose concentration you want to determine. You start with 25 ml HNO3 in the Erlenmeyer and titrate in the Ca(OH)2. At the end of the titration, you find that you have used 20.4 ml Ca(OH)2 and an additional 2.2ml HNO3 because you had to back-titrate. What's [HNO3]? A piece of copper weighing 1.06g is placed in 250.0ml of 0.20M AgNO3 solution. Cu(s) + AgNO3 rightarrow Ag(s) + Cu(NO3)2 How much (grams) copper can be dissolved by that much AgNO3 solution? Is there enough to dissolve the piece of copper? Justify your answer.Explanation / Answer
Ca(OH)2 + 2 HNO3 -------> Ca(NO3)2 + 2 H2O 9) moles of HNO3 = 2 * moles of Ca(OH)2 27.2 * M = 2 * 0.15 * 20.4 M = 0.225 Molar 10) a) Cu + 2 AgNO3 -----> 2 Ag + Cu(NO3)2 moles of AgNO3 = 0.25 * 0.2 = 0.05 mole moles of copper that can react = 0.05/2 = 0.025 mass of copper that can react = mole * mol wt. = 0.025 * 63.5 = 1.5875 g b) Yes, it is.
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