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Course: CHM 221, Fall 2009School: Cal Poly Pomona
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221 `060406 CHM Quiz 1 __KEY___ I. Fill in the blanks (1 pt per) 1. The t-test value for 3 degrees of freedom is 2.35 @ the 90% CL. Will the t value be less, equal, or greater @ the 95% CL? less 2. A 0.50 M Al2(SO 4)3 solution is 1.50 M in SO42- and 1.00 M in Al3+ 3.In the determination of iron in an ore, the Fe is precipitated, filtered, ignited and weighed as Fe3O4. If the results are expressed as % Fe2O3 the...
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221 `060406
CHM Quiz 1
__KEY___
I. Fill in the blanks (1 pt per) 1. The t-test value for 3 degrees of freedom is 2.35 @ the 90% CL. Will the t value be less, equal, or greater @ the 95% CL? less 2. A 0.50 M Al2(SO 4)3 solution is 1.50 M in SO42- and 1.00 M in Al3+ 3.In the determination of iron in an ore, the Fe is precipitated, filtered, ignited and weighed as Fe3O4. If the results are expressed as % Fe2O3 the gravimetric factor in chemical symbols is 3Fe 2O3/2Fe 3O4. 4. At 0C Kw = 1.0 10-15. The pH of pure H2O is 7.50 at this temp. II. 0.5000 g of impure oxalic acid (H2C2O4, gfw = 90.04) was analyzed gravimetrically by precipitating it as CaC 2O4H2O, then igniting it to CaO (gfw = 56.08) and weighing. The equations are H2C2O4 + CaCl 2 + 2NH3 + CaC H2O 2O4H2O(s) + 2NH 4Cl CaC 2O4H2O(s) + heat CaO(s) + CO + CO2 + H2O If 0.2600 g of CaO was obtained, calculate the % purity of the H2C2O4. 1 mol H2C2O4 yields 1 mol CaO % H2C2O4 = wt CaO/wt. sample 100 gfw H2C2O4 / gfw CaO % H2C2O4 = 0.2600 g / 0.5000 g 100 90.04 / 56.08 = 83.49 %
III. A solution is made 100.0 ppm in both Cl - and in SO42- from their potassium salts. Express the K+ concentration as (a) molarity, (b) pK, (c) ppm. At. wt. C...
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