The equlibrium constant is correct; however, when I do my ICE table and solve fo

Question

The equlibrium constant is correct; however, when I do my ICE table and solve for x and take the negative log of that for pH it is not right.  Also not sure what to do as far as molarity either.

A three-celled shaft of cross section shown in Figure 4 is subjected to a torque T=1000 Ib.-in. and has a shear modulus G. (Points A, B, C, D, E, and F are labeled on the Figure so that you may use them to be clear about the locations and directions of the shear flows and shear stresses in parts a) and b) below.) Find the shear flows everywhere on the cross-section. Use the labeled points on Figure 2 to be clear about the locations and directions of your results. Find the shear stresses everywhere on the cross-section. Use the labeled points on Figure 2 to be clear about the locations and directions of your results. Find the angle of rotation per unit length (0) and the torsional rigidity T.R. of the shaft. Express your answer in terms of G.

Explanation / Answer

HF + H20 = => H3O+ + HF2-

0.115 0 0 ........ initially

0.115-x x x

so

2.86*10^-4 = x^2/0.15-x

hence

x = 6.4*10^-3

hence

[H+] =6.4*10^-3

so

pH =-log[H+] =2.193

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