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

    16
    ReputationRep:
    Name:  Screenshot 2017-01-22 14.02.12.png
Views: 34
Size:  32.6 KB

    Is it:

    volume x density = mass
    moles = mass/mr ?
    • Thread Starter
    Offline

    16
    ReputationRep:
    Bump
    Offline

    17
    ReputationRep:
    You will find n(NaOH), some of that reacted with the HCl, the rest with the Pr-1-OH.
    • Thread Starter
    Offline

    16
    ReputationRep:
    (Original post by Pigster)
    You will find n(NaOH), some of that reacted with the HCl, the rest with the Pr-1-OH.
    ? doesnt NaOH react with the hcl, propan-1-ol AND propanoic acid?


    Im cant remember why but id written down:

    volume x density = mass
    moles = mass/mr
    Offline

    17
    ReputationRep:
    (Original post by kiiten)
    ? doesnt NaOH react with the hcl, propan-1-ol AND propanoic acid?
    Whooops, typo. It doesn't react with the alcohol, it will react with the HCl and th PrOOH.

    Since you're given volumes, you need to convert volume into mass to allow you to then convert into amounts.
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    (Original post by kiiten)
    Name:  Screenshot 2017-01-22 14.02.12.png
Views: 34
Size:  32.6 KB

    Is it:

    volume x density = mass
    moles = mass/mr ?
    Yes.
    • Thread Starter
    Offline

    16
    ReputationRep:
    (Original post by Pigster)
    Whooops, typo. It doesn't react with the alcohol, it will react with the HCl and th PrOOH.

    Since you're given volumes, you need to convert volume into mass to allow you to then convert into amounts.
    How do you know only hcl and propanoic acid reacts?
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    (Original post by kiiten)
    How do you know only hcl and propanoic acid reacts?
    Sodium hydroxide is a base and reacts with acids.

    But that's not what your question asked originally.
    • Thread Starter
    Offline

    16
    ReputationRep:
    (Original post by charco)
    Sodium hydroxide is a base and reacts with acids.

    But that's not what your question asked originally.
    Ah yeah of course so:

    volume of original method - volume of reacted mixture = volume of propanol?

    Then find mass (density x volume) and moles (mass/ mr)
    Offline

    13
    ReputationRep:
    (Original post by kiiten)
    Ah yeah of course so:

    volume of original method - volume of reacted mixture = volume of propanol?

    Then find mass (density x volume) and moles (mass/ mr)
    Actually they just want the moles of propanol from the start. So before you added it to the flaks. It's simply propanol volume × density to find the mass of propanol. Then mass/Mr.
    PS Fellow army here 👋
    • Thread Starter
    Offline

    16
    ReputationRep:
    (Original post by Selgomez11)
    Actually they just want the moles of propanol from the start. So before you added it to the flaks. It's simply propanol volume × density to find the mass of propanol. Then mass/Mr.
    PS Fellow army here 👋
    Hey

    Ughh so they included the other info for no reason?
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    (Original post by kiiten)
    Hey

    Ughh so they included the other info for no reason?
    Read the question carefully.

    You are probably going to use the other data later on in the question.
    • Thread Starter
    Offline

    16
    ReputationRep:
    (Original post by charco)
    Read the question carefully.

    You are probably going to use the other data later on in the question.
    Later on as in the questions after this e.g. part i)

    For this question is it just mass = volume x density then mass/mr ?

    Posted from TSR Mobile
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    (Original post by kiiten)
    Later on as in the questions after this e.g. part i)

    For this question is it just mass = volume x density then mass/mr ?

    Posted from TSR Mobile
    yes
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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