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

    1
    ReputationRep:
    According to wikipedia, lemsip contains 650 mg of paracetamol and 10 mg phenylephrine hydrochloride. Based on this, I'd like to caclulate the pH of a 500 cm^3 standard solution of one of these capsules.

    I know I'll have to use the Henderson–Hasselbalch equation, but I was curious as to how you can calculate the pH of a solution containing more than one chemical component?

    Also... How would I find out the [A-]/[HA] ratio?

    Sorry, potentially obvious answer here, I'm just stumped for some reason.

    +++If you'd like to help even more, I'm going to acidify this solution & was wondering how I would find exact quantities of HCl I'd need to add to achieve a desired pH?
 
 
 
  • 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
    Has a teacher ever helped you cheat?
  • 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

    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.