# Chemistry

posted by .

determine the pH of a 0.116 M Ba(OH)2 solution at 25 degrees C.

i keep getting 13.06 for this answer, but the answer is 13.37 :S

what i do is i take the negative log of the concentration which is 0.9355 which is pOH.

i know that pH = 14 - pOH
so i get pH = 13.06

where am i going wrong ? :S

• Chemistry -

haha I'm guessing your studying off the old chemistry multiple choice exam for tommorow's chemistry exam at ryerson?

• Chemistry -

You assumed barium hydroxide is totally dissociated. The solubility product constant is 5E-3.

• Chemistry -

Anya, do you know how to do number 4 on the final chemistry exam. Please tell me.

• Chemistry -

i figured it out, i have to multiple the concentration by 2 because of the 2 hydroxides right?

and yes i do know # 4

you want to convert 0.0354 mg/mL at 1 atm to mol/L at 0.00036 atm.

so :

(0.0354 mg/mL) x ( 0.00036)
= 1.2744 x 10^-5 mg*CO / mL

then you just want to convert units)

1.27 *10^-5 mg*CO/mL is 1.27 * 10 ^-5 g/L

multiply that by 1 mole CO/ 28 g

yyou get 4.5 * 10 ^ -7

• Chemistry -

Yeah I see what you did. I did the same thing in a slightly different way and got 4.5X10^-5. I see my mistake now

you have:

P1/C1=P2/C2

-----------
P1=1 C1=0.0354
P2=0.00036 C2?
-----------

1/0.0354=0.00036/C2

then you cross multiplied and then converted the value 1.27X10^-5 from grams to mols.

================================

Do you know how to do 6 can you tell me?

## Similar Questions

1. ### check math

Here are my answers. Can you check if I got the right answers?

Solve each system of equations, give the solution and state whether there are no solutions or many solutions. 1 )3x + 8y = 1 7x + 4y = 17 Answer: (3,1) 2) -3x + 5y = -7 9x + 2y = 38 Answer: (4,1) 3) 7r + 3s = 13 14r - 15s = -16 Answer: …

1 )3x + 8y = 1 7x + 4y = 17 Answer: (3,1) 2) -3x + 5y = -7 9x + 2y = 38 Answer: (4,1) 3) 7r + 3s = 13 14r - 15s = -16 Answer: (1,2) 4) 2x - 7y = 42 4x - 14y = 64 Answer: No Solution ?
4. ### Calculus

Determine whether the integral is divergent or convergent. If it is convergent, evaluate it and enter that value as your answer. If it diverges to infinity, state your answer as "INF" (without the quotation marks). If it diverges to …
5. ### Physics HELP HELP

(for some reason I keep getting this wrong. I put 90 for c, 5.6 for h and 22 for M(x), Then I took the natural log of both sides, but I keep getting it wrong) The mass of a radioactive element at time x is given by the equation below, …
6. ### Chemistry

Calculate the concentration (% W/V) of NaCl solution that was made by dissolving 15.0 g of sodium chloride in enough water to make 300.0 mL of solution. Okay the answer is 5.00%....however I keep getting 0.0500%....Why?
7. ### Precalculus

I keep getting wrong answer for this question. Write as a single logarithm log(x+1)+2log(2x+1)-log(x-3)
8. ### Precalculus

I keep getting wrong answer for this question. Write as a single logarithm log(x+1)+2log(2x+1)-log(x-3)
9. ### Precalc

1. Solve log (4x) = log (2) + log (x-1) the fact that this is x-1 and not + is really messing me up because i keep getting a negative number and that isnt possible 2. Solve: absolut value of(x^2 -4x-4) = 8 thanks so much!!! I have …
10. ### chemistry

Calculate the [H+] for a solution with [OH−] = −80 M. 1x10*-14/-80=-log(answer) How would I do this since I can not take the negative log of the previous anwser

More Similar Questions