At the University of Maryland one research group is trying to extract phosphorou

Question

At the University of Maryland one research group is trying to extract phosphorous from chicken litter in hopes of creating more eco-sustainable processes. The group is treating raw poultry litter in a two-step process. Step 1: Carbon dioxide is bubbled through water in order to create an acidic solution o1 H_2CO_3. Step 2. Raise the solution to a pH of 9 by adding NaOH. Write an equation that shows the acid hydrolysis for H_2CO_3. (Include phase labels) The solubility of CO_2 in step 1 can be increased by _____. i. Warming the solution ii. Cooling the solution Assuming that the pH in step 2 is entirely determined by the presence of NaOH. What must the concentration of NaOH be in step 2 in order for a pH of 9 to be achieved?

Explanation / Answer

a)

The hydrolysis for the acid:

CO2(g) + H2O(l) --> H2CO3(aq)

b)

CO2 will be more soluble if we cool the solution, typically, CO2 is more soluble in lower temperatures

c)

if pH = 9

then

pOH = 14-9 = 5

[OH-] = 10^-pOH = 10^-5 M

[NaOH] = 10^-5 M;

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