E2reviewkeyW12 - Chem.125/126 review E2 key EXPERIMENT...

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Chem.125/126 review E2 key ______ EXPERIMENT 2 (ELECTRONS AND SOLUTION COLOR) Part 1 Preparation of Solutions 1 . A . You prepare 100 mL of 0.10M manganese (II) sulfate for your study. How many grams of Mn(SO 4 ) (formula weight = 151) do you use? 151g/1mol x 0.10mol/1000mL x 100mL = 1.51g B . Which one or more of the statements below are correct with regard to the above prepared solution ( A )? Put a in either the “Correct” or “Incorrect” column. Statement Correct Incorrect 1. The prepared solution contains 10mmol of Mn 2+ ions. 2. If you add 100mL water to your prepared solution, the resulting sample = 0.025M. 3. You remove 10mL from the prepared solution ( A ). This 10mL sample = 0.01M. 2 . Below are the electron configurations for the ions Mn 2+ and Pb 2+ and their elements. Will solutions of MnSO 4 and PbBr 2 be colored or colorless? note: sulfate and bromide ions are colorless. Elemen t Electron Configuration of element Ion Electron Configuration of Ion Solution Colored or colorless?
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