Aqueous sulfuric acid solutions containing 15.0 wt% H2SO4 and 80.0 wt% H2SO4 are

Question

Aqueous sulfuric acid solutions containing 15.0 wt% H2SO4 and 80.0 wt% H2SO4 are mixed to form 60.0 wt% product solutions the 15% solution was in a laboratory in which the temperature was 77°F. The 80% solution had just been taken from a storage cabinet in an air-conditioned stockroom and was at a temperature of 60°F when the mixing occurred. (a) The mass of the 15% solution is 2.30 lbm. What mass of 60% solution should be weighed out? (b) Use Figure 8.5-1 to estimate the product solution temperature if the mixing is adiabatic. (See Example 8.5-3) (c) The product solution temperature eventually drops to to (77F). How much heat (Btu) is transferred from the solution to the laboratory air in this constant-pressure cooling process? (d) The dilution can be carried out either by slowly adding the 15% solution to the 80% solution or vice versa. Use figure 8.5-1 to determine the maximum temperature that would be attained using each procedure. Which procedure would be safer?

( please include all the details to the solution) Chemical Engineering

Explanation / Answer

1.

2.3 lb of 15 % sol

let x be wt of 80 % sol

sot wt of 60 % sol = 2.3 + x lb

let us make a mass balance to find out x

(2.3*.15) + (x*.8) = (2.3+x) * .6

x= 5.175 lb

so wt of 60 % sol is 5.175 + 2.3 =7.475 lb

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