chemistry questions..hope u all stop by :)

[Monopoly]

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

any data given about K_a?

[AS-Girl]

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

It was [H+]

i got all the steps
Thanks Amii

[AS-Girl]

any data given about K_a?

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]

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

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

[Amii]

Genius!!
i donno wat are u guys talking about! i am still an igcse newbie

LOL No - it's just pressing the buttons in the calculator 

It was [H+]

i got all the steps
Thanks Amii

No problem - Take care 

[AS-Girl]

Thanks Amii.....u saved my life 

[NotAbod]

LOL No - it's just pressing the buttons in the calculator 

No problem - Take care 

or really? lol 
but these questions are new to me. i just understood question 2, and i gave the answer to it. donno even if its correct