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lecture+9+mixing+of+acid

# lecture+9+mixing+of+acid - Quiz 2 Upgrading Spent Sulfuric...

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Quiz # 2 Upgrading Spent Sulfuric Acid in a Continuous Mixer To prepare a solution of 50.0 % sulfuric acid, a dilute waste acid containing 28.0 % H 2 SO 4 is fortified with a purchased acid containing 96.0 % H 2 SO 4 . How many kilograms of the purchased acid must be bought for each 100 kg of dilute acid?

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Example: Upgrading Spent H 2 SO 4 mixer 0.28 H 2 SO 4 H 2 0 F = mass fraction 0.96 H 2 SO 4 H 2 O A = CV!!! 0.5 H 2 SO 4 H 2 O P = Mass Balance on H 2 SO 4 (.28)(100) + 0.96A = 0.5P Overall Mass Balance 100 + A = P Hence working out algebra: A = 47.8 kg P = 147.8 kg Fill in the rest. Water balance could be done in lieu of overall. Only 2 of 3 are independent! (i.e. 0.72(100) + 0.04A = 0.5P) 28 72 73.9 73.9 147.8 kg 45.9 1.9 47.8 kg Basis: 100 kg of dilute acid 100 kg 0.5 0.72 0.04
Many times we get simultaneous Linear Equations eq. from acid spent problem (1) 0.96A – 0.5P = - 0.28(100) (2) 0.04A – 0.5P = - 0.72(100) A = 47.8 P = 147.8 Equations (1) and (2) are simultaneous linear equations

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lecture+9+mixing+of+acid - Quiz 2 Upgrading Spent Sulfuric...

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