Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    7
    ReputationRep:
    Could someone tell me if I am doing this correctly?

    You need to make 150mM solution of NaCl (MW = 58 g/mol)

    How much NaCl do you need to make 1L (in moles)?

    150x10^-3 M = 0.15 moles

    How much NaCl do you need to make 1L (in grams)?

    0.15 M x 58 g/mol = 8.7 g/L
    8.7 g

    If you wanted to make 250mL, how much NaCl do you need (in grams)?

    8.7 g/4 = 2.18 g
    Offline

    19
    ReputationRep:
    Looks fine
    • Thread Starter
    Offline

    7
    ReputationRep:
    (Original post by alow)
    Looks fine
    Thanks! Could you have a look at my attachment please? I don't think it's correct.

    I got all the molar concentrations to be under 0.3M and I think blood is 0.3M so all the solutions would be hypotonic.
    Attached Images
     
    • Thread Starter
    Offline

    7
    ReputationRep:
    Aaanybody?
    • Thread Starter
    Offline

    7
    ReputationRep:
    Aaaaaanybody?
    Offline

    19
    ReputationRep:
    i'll bump for you but haven't done chem since june and forgot everything so can't help soz
    Offline

    10
    ReputationRep:
    (Original post by elef95)
    Aaaaaanybody?
    You might not be getting any responses because you're asking a biology question in the chemistry forum, you'll probably get more help asking some biologists
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.