a chemist for an agricultural products company, you have just developed a new he

Question

a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively. A sparingly soluble salt, Herbigon is dissolved in 1 M acetic acid for technical reasons having to do with its production. You have determined that the solubility product K_sp of Herbigon is 9.10

Explanation / Answer

The question is assuming that when acid is added to XAc (Ac = acetate ion), it reacts with the Ac forming X and HAc b/c H has a strong attraction for Ac which gives it the ability to force XAc to dissolve. The equation for disassociation of all the ions involved is: ......................XAc(s) + HAc(aq) ~> X(aq) + H(aq) + Ac(aq) initial conc......................1M ............. 0............ 0.......... 0 change.............................. -a............ 0.006........ a..... a+0.006 final................................. 1-a ............ 0.006....... a...... a+0.006 The acid-base equilibrium relation for acetic acid is used to find H and pH: Ka = [H][Ac]/[HAc] = a(a+0.006)/(1-a) = 10^(-4.76) = 1.74x10^-5. The 10^(-4.76) is the Ka obtained from pKa. Simplify the equation: a^2+0.0060174a-1.74x10^-5=0 Solve: a=0.00213M=[H] pH=-log[H]=2.22

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