Help Solve PH Homework: NaOH + H20 at 25degrees

[geffman1]

Homework Statement

We add 0.535 g of NaOH to 100.0 mL of water at 25degrees. What is [H3O+] in this solution at 25degrees?

hey guys, I've practiced these types of questions a lot, but I've never came across one like this before. i tried writing equations and i got this 2NaOH+2H20>>2Na+2H30, but I am stuck at the next step. anyhelp would be good. thanks

ANSWER=7.48 x 10-14 M

(p.s) if anyone could sit down with me on msn or something for 20minutes I've got about 15 basic question i need help with (ive got the answers). thanks

 

[symbolipoint]

If that NaOH concentration is not too excessive for the model, you can try finding expected [OH^-] and then use pH + pOH = 14

 

[Borek]

water ion product

 

[geffman1]

ta, could you help me write the equation then because i can't get it to balance good? tnaks

 

[Borek]

Your equation won't have H⁺ in it.

Check the page I have lined to. To start you have to calculate [OH^-].

 

[geffman1]

can i just write it like this..NaOH>Na+OH

 

[Borek]

Don't ignore charges, these are ions. But otherwise you are on the right track, this is just a simple dissociation.