# Thread: omg help! chemistry help!!11

1. oh god oh god oh god...need help !!11

Determine the volume of .200M NaOH required to completely neutralize 250.0mL of 0.220M H3PO4.

i need the steps on how to do this (above)

oh god

Determine the new concentration after these dilutions:

a) 150mL of .450M HCl to 4.50L

b) 40.0mL of 1.8M NaOH to 800.0mL

Calculate the concentration of each ion after mixing these solutions wher NO REACTION occurs:

a) 2.0L of 0.60M Copper (II) Nitrate and 2.0L of 0.20M Iron (III) Nitrate

b) 400.0mL of 0.200M Aluminum Chloride and 200.0mL of 0.300M Sodium Chloride

please guys, you're my last hope, i have no idea how to do this and it's due tomorrow. i forgot my binder at school and all my notes are in there, i looked on google but i can't find a good example(s) of it or steps on how to do it. PLEASE HELP ME!!!!

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3. Damn meng, Im pretty sure none of these mofos in the lounge know wtf this stuff is.

4. i think i figured out number 1, not sure, could someone confirm on it?:

Equation (please lemme know if its balanced properly!):

H3PO4 + 3NaOH --> 3H2O + Na3PO4

n=CV --> 0.250L(0.200M H3PO4) = 0.0550 moles H3PO4
NaOH:H3PO4 --> 3:1 --> 3(0.0550moles H3PO4) = 0.165 moles NaOH
0.165mole NaOH/0.200M --> 0.825L of NaOH is required to completely neutralize the H3PO4.

5. yeah......yeah that looks pretty good to me

6. Looks completely wrong to me, unfortunately I'm off to my interview now. Maybe laters.

7. damnit mchesh now ur making me even more worried ahhhhhhhhh

8. Originally Posted by Linkin Park
Damn meng, Im pretty sure none of these mofos in the lounge know wtf this stuff is.

9. well he is rite, when was the last time anyone in the lounge actually helped someone instead of spamming the fuck out of a thread? maybe i posted this in the wrong place....

10. Yeah, maybe we need a "I-need-someone-else-to-do-my-homework-world".

11. Originally Posted by Guillaume
Yeah, maybe we need a "I-need-someone-else-to-do-my-homework-world".
I think its great when people ask for solutions to homework whether its essays/maths whatever - reminds me to get of things i once knew - if i know the answer ill say so

I never did physics nor chemistry in school - pity - tons of usefull info there for the later life.

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