# General Chemistry

So I've been working on this online homework problem and got it wrong 8 times. I need help. Here's the question:

1,2-diaminoethane, H2N-CH2-CH2-NH2, is used extensively in the synthesis of compounds containing transition-metal complexes in water. If pK_b1 = 3.29 and pK_b2=6.44, what is the pH of a 2.58x10^-4 M solution of diaminoethane?

I first solved for Kb1 and Kb2 using the formula K_b1= 1x10^(pK_b1).
After that I made an ICE-table and plugged my values from that table into
K_b1= ( [1,2-diaminoethaneH+] * [OH-])/ [1,2-diaminoethane]
I solved for x using the quadratic formula and got 3.638x10^-4

I then plugged x into the formula pOH=-log(3.638x10^-4) = 3.44
Then finally solved for pH
pH = 14 - pOH
pH = 14 - 3.44 = 10.56

What is it that I'm doing wrong?

1. 👍 0
2. 👎 0
3. 👁 468

## Similar Questions

1. ### solving Equations

Solve x square pluse 5x subtracting by 6 equals zero? X^2 + 5x - 6 = 0 Solve by factoring. 3 and 2 will do it. heres the right answer.... (x-1)(x+6)=0 x=1 x=-6 Let's see if that is the right answer. The first number is the product

asked by shanna on October 17, 2006
2. ### Math

Hi, I am getting very frustrated. I am doing an online homework for chemistry and it's telling me to round to the nearest WHOLE number. So the answer I got was -1435.650.... And I typed in -1436. and said I was wrong and so I

asked by Anonymous on August 4, 2010
3. ### Chemistry problem check

Compelete the following table for an ideal gas. P= 7.74*10^3 Pa V= 10.3 mL N= ? T= 25°C I'm getting 3.20e-4, but my online homework says its wrong, what am I doing wrong?

asked by Mary on June 27, 2013

Compelete the following table for an ideal gas. P= 7.74*10^3 Pa V= 10.3 mL N= ? T= 25°C I'm getting 3.20e-4, but my online homework says its wrong, what am I doing wrong?

asked by Mary on June 27, 2013

Compelete the following table for an ideal gas. P= 7.74*10^3 Pa V= 10.3 mL N= ? T= 25°C I'm getting 3.20e-4, but my online homework says its wrong, what am I doing wrong?

asked by Mary on June 27, 2013

Compelete the following table for an ideal gas. P= 7.74*10^3 Pa V= 10.3 mL N= ? T= 25°C I'm getting 3.20e-4, but my online homework says its wrong, what am I doing wrong?

asked by Mary on June 27, 2013
7. ### Calculus

I've been working on this problem for while, and I keep getting the answer wrong every time I do it. The volume of the solid obtained by rotating the region enclosed by y=e^(5x+1) y=0 x=0 x=0.8 about the x-axis can be computed

asked by Anonymous on February 9, 2013
8. ### Algebra II

Working on my online math homework, I encountered this problem: Solve: (3x^-1 y^-2)^-2 (x^2 y^5)^-1 [[Spaces denote the end of the exponent.]] Because of the law of exponents that deals with negative exponents, I did the

asked by Kenneth on January 25, 2012
9. ### math

Q. five times the sum of 3 and some number is 70. What is the number? I did the problem and got 13...but the answer is 11. I cannot figure out what I am doing wrong?? You must use parentheses when it says sum. 5(x +3) = 70 is

asked by catalina on January 26, 2007
10. ### Intermediate algebra, concepts and graphs

How do I solve the absolute value of: (x-2)>1? I am completely lost and my homework online is saying I did it wrong. I came up with 3

asked by Lisa on June 14, 2013

More Similar Questions