Question

A substance with a hydroxide ion concentration of 1.55 x 10-11 M will have a pH of ___.

I got 3.19 is that right?

Answer 1

2 sec need to get my hands on a cal.

Answer 2

ok please cuz I have like 4 more like this lol

Answer 3

it's just I want to be sure I did them right, Thanks so much!

Answer 4

Yea it is right. :)

Answer 5

ty

Answer 6

my next one would be
What is the hydronium ion concentration of a solution with a pH of 2.57?
I got 2.7 * 10^-3

Answer 7

Correct :)

Answer 8

Any more? :)

Answer 9

yup but just a quick question,
Molar mass is the number of grams of a given compound in one mole of the compound
and 6.02 x 10^23 particles of the compound. Or is it just one mole of a compound?

Answer 10

@Frostbite u there?

Answer 11

Yea I'm here. just doing multiple things are the same time.

Molar mass is the number of grams for 1 mol of the compound yes. Also what the definition say:\[\Large M=\frac{ m }{ n }\] Set \(n=1\)\[\Large M=m\]

And when we say we got 1 mole of molecules we then mean we got 6.02 x 10^23 molecules yes.

Answer 12

ok my next question is
You have 350 mL of a gas at a pressure of 2.4 atm. If the volume is increased to 575 mL, what is the new pressure?
I got .68 atm is that right?

Answer 13

Emmm.
\[\Large p _{1}V _{1}=p _{2}V _{2}\]
Did you use that equation?

Answer 14

yes but i used my calculator

Answer 15

nvm got it :)

Answer 16

Hehe well I can only do it in my head:
\[\Large p _{2}=\frac{ p _{1}V _{1} }{ V _{2} }=\frac{ 350 ml \times 2.4 atm }{ 575ml }\]

Answer 17

it was right?

Answer 18

nope

Answer 19

1.46 atm instead?

Answer 20

yup

Answer 21

The head (almost) never fails ;)

Answer 22

Anything else I can assist with? :)