Turn on thread page Beta

How do pH values change when weak acids are neutralised? watch

    • Thread Starter
    Offline

    2
    ReputationRep:
    Please give examples of the weak acid and also the website you found the info on (if used)? I've literally been trawling the internet since yesterday and found 1 sort of ok-ish answer, it's for my chem CA resit and i really need some information to write up on.
    Thank you!
    Offline

    15
    ReputationRep:
    When you neutralise any acid, you must be adding a base (such as ammonia - weak base) so the pH will increase - becoming more basic. If you add a strong base (sodium hydroxide) to a strong acid (hydrochloric acid) then the pH will start of low and then will end up high.
    If you add a weak base (ammonia) to a strong acid then the pH will start off low and end up at around 9-10.
    If you use weak acids then the pH will start off higher - at around 3-5 - but will end up the same as if you used a strong acid.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by B_9710)
    When you neutralise any acid, you must be adding a base (such as ammonia - weak base) so the pH will increase - becoming more basic. If you add a strong base (sodium hydroxide) to a strong acid (hydrochloric acid) then the pH will start of low and then will end up high.
    If you add a weak base (ammonia) to a strong acid then the pH will start off low and end up at around 9-10.
    If you use weak acids then the pH will start off higher - at around 3-5 - but will end up the same as if you used a strong acid.
    THANK YOU SO MUCH - but do you have a website that says this? I wish i could reference you but apparently answer sites are unreliable sources...
    Offline

    15
    ReputationRep:
    (Original post by tinawu)
    THANK YOU SO MUCH - but do you have a website that says this? I wish i could reference you but apparently answer sites are unreliable sources...
    To be honest for all this information just go to chemguide - search it on google - it is an A-level website but it goes through (everything) - there are pages about acid base reactions that you can learn from and so you can also reference it aswell.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by B_9710)
    To be honest for all this information just go to chemguide - search it on google - it is an A-level website but it goes through (everything) - there are pages about acid base reactions that you can learn from and so you can also reference it aswell.
    Is adding a base the only way to neutralise an acid? and also, is an alkali a base?
    Offline

    15
    ReputationRep:
    (Original post by tinawu)
    Is adding a base the only way to neutralise an acid? and also, is an alkali a base?
    Yes the only way to neutralise an acid is to add a base.
    An alkalai is a base that is soluble in water. All alkalais are bases, but not all bases are alkalais.
 
 
 
The home of Results and Clearing

1,163

people online now

1,567,000

students helped last year

University open days

  1. Bournemouth University
    Clearing Open Day Undergraduate
    Wed, 22 Aug '18
  2. University of Buckingham
    Postgraduate Open Evening Postgraduate
    Thu, 23 Aug '18
  3. University of Glasgow
    All Subjects Undergraduate
    Tue, 28 Aug '18
Poll
How are you feeling about GCSE results day?
Useful resources

Study tools

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Thinking about uni already?

Thinking about uni already?

See where you can apply with our uni match tool

Student chat

Ask a question

Chat to other GCSE students and get your study questions answered.

Creating

Make study resources

Create all the resources you need to get the grades.

Planner

Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

Papers

Find past papers

100s of GCSE past papers for all your subjects at your fingertips.

Help out other students

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

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.