Please Help CHEM

posted by .

Can you please tell me if these are right?
Determine the pH for the following solutions
A [OH-] = 1.0 X 10^-7 M
I got 7
B. [H3O+ = 4.2 X 10 ^-3M
I got 2.4
C. [H3O+]= 0.0001M
I got 4
D. [OH-] = 8.5 X10^-9M
I got 5.9

What are the [H3O+] and [OH-] for a solution with the following pH values?
a. 10.0
For [OH-] I got 1.0*10^-4. and [H3O+] a. 10.0 I get 1.0*10^-10


Thank you!

And could you please tell me how to figure this question out?

Solution X has a pH of 9.5 and solution Y has a pH of 7.5.
a. what solution is more acidic?
b. what is the [H3O+] in each?
c. what is the [OH-] in each?

  • Please Help CHEM -

    The first four are correct.

    lower pH is more acid.

    b. [H3O+]=log^-1 (9.5)=3.16E9
    the antilog or log^-1 key might be the 10x key on your calculator.

    pOH=14-pH=14-9.5=4.5
    [OH-]=antilog (4.5)=3.2E4

    Notice [OH][H}= 1E14, which offers another way to solve it.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    What volume of .101 M HNO3 is required to neutralize each of the following solutions?
  2. Chem

    Could you please tell me if these are right?
  3. Chem

    Please tell me if these are right. How many grams are needed to obtain 1.5 moles of magnesium oxide?
  4. Chem

    Please help are these right? A 2.3 mole sample of nitrogen (N2), has a volume of 50.0 L and a pressure of 630 mmHg. What is the temperature of the gas?
  5. Chem

    could you tell me if these are right and help me with the other 2 I cant seem to get them to come out. Calculate the pH of each solution given the following [H3O+] or [OH -] values. (a) [H3O+] = 1.5 10-8 M 1.0E-7 is what I got (b) …
  6. chem

    Can you please tell me if these are right?
  7. Help Chemistry

    Can you please tell me if these are right?
  8. Chem

    Please tell me if these are right! What are the [H3O+] and [OH-] for a solution with the following pH values?
  9. chem

    Calculate the pH of each of the following solutions. (a) [H3O+] = 2.9 10-10 M- I got 9.5 but its wrong. I used the equation pH= -log[H3O+] Is this the wrong equation?
  10. Alegra

    Suppose that a spreadsheet contains the following values. A1 6 B1 -4 C1 2 D1 3 Determine the value of cell E1 if it contains the following formulas. a) +A1 + B1 E1= 2 got that one right b) +4*A1 + 5*B1 got that one wrong c) +C1*(A1 …

More Similar Questions