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Thread: omg help! chemistry help!!11

  1. #1
    cpt_azad's Avatar Colonel
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    Tongue

    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!!!!

    Jeff Loomis: He's so good, he doesn't need to be dead to have a tribute.

  2. Lounge   -   #2
    S!X's Avatar L33T Member BT Rep: +5
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    Damn meng, Im pretty sure none of these mofos in the lounge know wtf this stuff is.

  3. Lounge   -   #3
    cpt_azad's Avatar Colonel
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    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.

    Jeff Loomis: He's so good, he doesn't need to be dead to have a tribute.

  4. Lounge   -   #4
    Mr. Mulder's Avatar pepper your angus BT Rep: +10BT Rep +10
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    yeah......yeah that looks pretty good to me

  5. Lounge   -   #5
    MCHeshPants420's Avatar Fake Shemp
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    Looks completely wrong to me, unfortunately I'm off to my interview now. Maybe laters.

  6. Lounge   -   #6
    cpt_azad's Avatar Colonel
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    damnit mchesh now ur making me even more worried ahhhhhhhhh

    Jeff Loomis: He's so good, he doesn't need to be dead to have a tribute.

  7. Lounge   -   #7
    Quote Originally Posted by Linkin Park
    Damn meng, Im pretty sure none of these mofos in the lounge know wtf this stuff is.

  8. Lounge   -   #8
    cpt_azad's Avatar Colonel
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    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....

    Jeff Loomis: He's so good, he doesn't need to be dead to have a tribute.

  9. Lounge   -   #9
    Guillaume's Avatar Kentish old lady BT Rep: +8BT Rep +8
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    Yeah, maybe we need a "I-need-someone-else-to-do-my-homework-world".

  10. Lounge   -   #10
    Quote 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
    they generally add different topics to the board instead of usual sftwr/hrdwr/fileshr/igottagreatlink/myanusitches threads.

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

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