Question

What is the pH of a solution with a [H+] of 1.0 × 104 M?
(Points : 1)
2.0

3.0

4.0

8.0

Answer 1

A cup of black coffee has a pH of 5. What is the hydrogen ion concentration of this cup of coffee?
(Points : 1)
3.0 × 10 negative5 M

1.0 × 10negative5 M

4.0 × 10 negative4 M

4.0 × 10 negative6 M

Answer 2

I think what you do is do punch in

pH = -log(H+ concentration)

so pH = -log(1.0 X 10^4)

im assuming that 104 is 10^4?

Answer 3

its 10^-4

Answer 4

I think the first one should be 4 if you put it in the calculator

pH = -log(1.0 X 10^-4)

Answer 5

is it D?

Answer 6

you didnt put letters for your options but i guess it would be c) 4.0

Answer 7

thanks could you help with the other one

Answer 8

i believe it is 1.0 × 10negative5 M

because the formula to find pH is -log(H+ concentration)

so you plug the values in

5 = -log(H+) ---(H+ is what you are trying to find)

then you get rid of the -log by doing 10^-5

and 10^-5 is 1.0 x 10 negative 5

Answer 9

okay thank you