8. What is the above concentration in ppm? 9. 50 ppm of a Nacl solution M. a 10.

Question

8. What is the above concentration in ppm? 9. 50 ppm of a Nacl solution M. a 10. Ca(NO, 2 4H20 (MW 236.5) Ca(NO MW-164.15 A recipe calls for 100 g of anhydrous Ca(NO However, all that is in the stock room is Ca(NO) 4H20. How many grams should you add of Ca(NO 4H2O 11. Stock solution: 2.0 M Naci 300 mL of o.04 M are required. How many mus of stock are needed? 12. How many grams of KCI are required to make a 2.0 osm solution with an 30sm approximate volume of 2 L? osmoleliny of plasma 30DMOsm o osmolality Chapter

Explanation / Answer

9. 50ppm = 50mg/L

Molarity = (PPM value *10-3)/Atomic weight

A.W. of NaCl = 58.44g/mol

Molarity = (50*10-3g/58.44g/mol)/L

= 0.855*10-3mol/L

11. M1V1 = M2V2

0.04M*300ml = 2.0M*V2

V2 = 0.04M*300ml/2.0M

= 6ml of stock solution

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