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Workshop 4 answers - 4 Write the net ionic equation for...

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NAMES: ____________________________________________________________ WORKSHOP 4 (20 points) Solution Stoichiometry Spring 2011 1. (3 points )What would the concentration be if you used 27g of calcium chloride to make 500. mL of solution? What is the concentration of each ion? 27g/ 111 g/mol= 0.243 mol 0.243mol/0.5L= 0.486 M [Ca 2+ ]=0.486 M [Cl - ] =0.973 M 2. (a) What is an electrolyte? Give an example of strong, weak and non-electrolyte (each). (b) What is a substance that takes in or dissolves other substances? solvent 3. How much acetone (CH 3 COCH 3 ) (in moles) would be needed to obtain 7.85 L of acetone? The density of acetone is 0.851 g/mL. MM (acetone) = 58g/mol m= d*V= 0.851g/ml* 7850ml=6680.35 g #moles= 6680.35g/58g/mol= 115 mol

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Unformatted text preview: 4. Write the net ionic equation for this reaction occurring in water: Sodium phosphate and calcium chloride are mixed to form ………… 2 PO 3 − 4 + 3Ca 2+ → Ca 3 (PO 4 ) 2 5. What acid and what base would you choose to prepare the salt potassium perchlorate? HClO 4 and KOH 6. (4 pts) Consider the redox reaction (unbalanced) MnO − 4 + 5Ni 2+ + H + → Mn 2+ + 8Ni 3+ + H 2 O (a) Identify half-reactions (oxidation and reduction). Mn 7+ → Mn 2+ +5 e- red /1 Ni 2+ +1 e-→ Ni 3+ oxid /* 5 (b) How much Ni 2+ (in grams) is used if 5.00 millimoles of Mn 2+ are produced? # mol of Ni 2+ = 5*5mmol= 25mmol 25mmols * 58.6g/mol= 1450mg= 1.45g...
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Workshop 4 answers - 4 Write the net ionic equation for...

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