Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources
Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study
Go to the blog

Titration Curves: Understanding pH Changes in Acid-Base Reactions, Study Guides, Projects, Research of Chemistry

Edge Hill UniversityChemistry

The concept of titration curves, focusing on the changes in ph during the titration of strong and weak acids and bases using standard solutions. It covers the use of indicators and the production of neutral, basic, and acidic salt solutions.

What you will learn

  • What is a standard solution in a titration?
  • How does the pH change during the titration of a weak acid with a strong base?
  • What indicator should be used for the titration of a weak base with a strong acid?

Typology: Study Guides, Projects, Research

2021/2022

Uploaded on 09/27/2022

dreamingofyou
dreamingofyou 🇬🇧

4.5

(15)

233 documents

1 / 4

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Titration Curves
•in order to perform a titration, you must start
with a standardized solution
standard (or standardized) solution = solution
with a precisely known concentration
•standard solutions can be prepared by
> using a substance which can be obtained in a pure and stable
form (does not absorb water or CO2 from air) and which has
a known molar mass so that it can be used to prepare a
solution of known concentration (primary standard)
ex. potassium hydrogen phthalate - KHC8H4O4
oxalic acid dihydrate - H2C2O4•2H2O
> titrating a base with an acidic primary standard
•a titration curve is produced by plotting the pH
change that occurs during a titration
pf3
pf4

Partial preview of the text

Download Titration Curves: Understanding pH Changes in Acid-Base Reactions and more Study Guides, Projects, Research Chemistry in PDF only on Docsity!

Titration Curves

  • in order to perform a titration, you must start with a standardized solution standard (or standardized) solution = solution with a precisely known concentration
  • standard solutions can be prepared by

using a substance which can be obtained in a pure and stable form (does not absorb water or CO 2 from air) and which has a known molar mass so that it can be used to prepare a solution of known concentration (primary standard) ex. potassium hydrogen phthalate - KHC 8 H 4 O 4 oxalic acid dihydrate - H 2 C 2 O 4 • 2 H 2 O titrating a base with an acidic primary standard

  • a titration curve is produced by plotting the pH change that occurs during a titration

a) Titration of a strong acid with a strong base

  • the pH rises almost vertically around the value of VB
  • VB is the volume of the base required to reach the equivalence point
  • strong acid - strong base titration produce a neutral salt solution so pH = 7 at the equivalence point
  • choose indicator which changes colour around pH = 7 (pKin = 7 ) such as phenol red or neutral red

c) Titration of a weak base with a strong acid

  • similar to weak acid and strong base, except curve is flipped upside down
  • graph gives pH values not pOH, therefore pHs need to be converted to pOH
  • weak base - strong acid titration produces acidic salt solution with pH < 7 at equivalence point
  • titration requires an indicator which changes colour at pH < 7 (pKa < 7 ) such as methyl red strong acid + strong base → neutral (pH = 7 ) weak acid + strong base → basic (pH > 7 ) strong acid + weak base → acidic (pH < 7 ) Note: Phenolpthalein (pH 8. 2 - 10. 0 ) is used for weak acid - strong base titrations but it is also often used for strong acid - strong base titrations even though pH = 7 at the equivalence point. This is because there is a dramatic colourless to magenta colour change.