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skills test#7-1

skills test#7-1 - The UTS Web Testing System Test Chemistry...

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The UTS Web Testing System Test: Chemistry Skill Check System - 7. Solutions and Dilutions Date: 03/30/2008 Time: 22:31:05 America/New_York User: enl5018 Lambert Erica N. IP: 128.118.185.233 Test Pilot Submission Confirmation Click here to get more practice. You received 5 out of a possible 7 points or 71% There were 5 questions whose answers received full or partial credit. When 27 mL of a 120 mL stock solution containing 1.6 M AlCl 3 is diluted to 70 mL, what is the concentration of Al 3+ in the new solution? DO NOT use scientific notation. Always report your answer with 3 significant figures. 1 point awarded for 0.617 Right! How would you work this problem differently if it had asked for moles of ions instead of concentration? This response was awarded 1 point out of a possible maximum of 1 point. A stock solution is prepared by adding 28 mL of 0.5 M AlBr 3 to enough water to make 71 mL. How many moles of Br - are in 53 mL of the stock solution? DO NOT use scientific notation. Always report your answer with 3 significant figures.
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