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chemistry questions..hope u all stop by :)

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Monopoly:

--- Quote from: AS-Girl on April 06, 2011, 01:58:08 pm ---If the pH of juice is 1.80, then the hydrogen ion concentration [H+] of the juice is:
a) 1.00 X10^-2 mole/liter
b)1.80 X 10^-2 mole/liter
c) 6.31 X10^-2 mole/liter
d) 1.58 X10^-2 mole/ liter


--- End quote ---

any data given about Ka?

AS-Girl:

--- Quote from: Amii on April 06, 2011, 09:31:23 pm ---Hydroxide ion concentration or hydrogen ion concentration ?

[OH-] would be 10-5 =1 X 10 -5 mol/dm3

Thus [H+] =  1 X 10-14
                   --------
                   1 X 10-5

=1X10-9 mol/dm3

--- End quote ---
It was [H+]

i got all the steps :D
Thanks Amii

AS-Girl:

--- Quote from: Monopoly on April 07, 2011, 02:51:12 am ---any data given about Ka?

--- End quote ---

they just wrote..Kw=[1X10^(-14)]

AS-Girl:
last question..i swear lool

The molar concentration of 1.0 liter solution made by dissolving thr molar mass of solid sodium hydroxide (NaOH) in water is:
a) 0.50 mole/lier
b) 1.00 mole/liter
c) 0.10 mole/liter
d) 0.01 mole/liter


This is the last one hehe

elemis:

--- Quote from: AS-Girl on April 07, 2011, 12:28:57 pm ---last question..i swear lool

The molar concentration of 1.0 liter solution made by dissolving thr molar mass of solid sodium hydroxide (NaOH) in water is:
a) 0.50 mole/lier
b) 1.00 mole/liter
c) 0.10 mole/liter
d) 0.01 mole/liter


This is the last one hehe

--- End quote ---

It should be B. They say the molar mass of NaOH so that means one mole of NaOH is dissolved in 1 litre of water.

Concentration = no. of moles / volume

hence, 1mole/litre

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