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Solutions Quiz 2

Solutions Quiz 2 - 4 How many moles of CaCl 2 are in 250 mL...

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CHEM 120 Chapter 7 Solutions Practice Quiz 2 Name ________________________________ (2pts) 1. Show dissociation of lithium phosphate (indicate the type of arrow you would use. Why would you use this type of arrow? Li 3 (PO 4 ) à 3 Li + (aq) + (PO 4 ) 3- (aq) Single arrow shown for almost complete about 99% of dissociation of strong electrolyte (2pts) 2. Show dissociation of acetic acid (indicate the type of arrow you would use) Why would you use this type of arrow? HC 2 H 3 O 2 H + (aq) + C 2 H 3 O 2 - (aq) Double arrow shown for just about 5% dissociation of weak electrolyte (2pts) 3. A 0.10 M HCl solution was prepared from 25 mL of a 6.0 M HCl solution. What is the final volume of the new solution? ( error, should be volume and not concentration) C 1 V 1 = C 2 V 2 6.0 M x 25 ml = 0.10 M x V 2 V 2 = 1500 ml (2 pts)

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Unformatted text preview: 4. How many moles of CaCl 2 are in 250 mL of a 3.0 M of CaCl 2 solution? M = moles/ L Convert 250 ml to 0.250 L and then plug into the equation to solve for moles, the big M is 3.0 Answer: 0.75 moles (1 pt) 5. What is the concentration, in m/v% of a solution prepared from 50. g NaCl and 2.5 L of water? (error, should read m/m%) 2.5 L of water which is 2500 ml of water which is 2500 g of water because D=M/V and D of water is 1.0 g/ml g of solute = 50. g of NaCl g of solution = (50. g of NaCl + 2500 g of water) [50.g/(2550g)] x 100 = 2.0 m/m% (1 pt) 6. What is a hypotonic solution? A prepared solution whose concentration is lower than what its supposed to be in order to match the osmotic pressure of the solution in our body....
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