D

#### deleted647690

I was confused on this question, but I think I figured out my confusion, could someone tell me if I'm thinking about this correctly?

At first, I was confused as to why you would just calculate the number of moles of HEW. I knew that it was a 1:1 molar ratio at the equivalence point, so moles HEW = moles NAG3, and I didn't see why you couldn't just use moles of NAG3.

But then I realized that 4 equivalents of NAG3 were needed to neutralize 1 equivalent of HEW:

1*10^-3 L * .1*10^-3 mol/L HEW = 1 *10^7 mol HEW

10*10^-6 L * 2.5 * 10^-3 mol/ L NAG3 = 25 * 10 ^-9 mol NAG3

0.1 * 10^-6 mol HEW / 25 * 10 ^ -9 mol NAG 3 = 4

So the moles of NAG3 must be multiplied by a factor of 4 to get an equivalent of HEW, thus giving you the same number of moles of HEW needed for the equivalence point.

Not sure if I'm using the term "equivalence" correctly for that factor of 4 that I found above

At first, I was confused as to why you would just calculate the number of moles of HEW. I knew that it was a 1:1 molar ratio at the equivalence point, so moles HEW = moles NAG3, and I didn't see why you couldn't just use moles of NAG3.

But then I realized that 4 equivalents of NAG3 were needed to neutralize 1 equivalent of HEW:

1*10^-3 L * .1*10^-3 mol/L HEW = 1 *10^7 mol HEW

10*10^-6 L * 2.5 * 10^-3 mol/ L NAG3 = 25 * 10 ^-9 mol NAG3

0.1 * 10^-6 mol HEW / 25 * 10 ^ -9 mol NAG 3 = 4

So the moles of NAG3 must be multiplied by a factor of 4 to get an equivalent of HEW, thus giving you the same number of moles of HEW needed for the equivalence point.

Not sure if I'm using the term "equivalence" correctly for that factor of 4 that I found above