Social Media Means
Photo by Aleksandar Pasaric Pexels Logo Photo: Aleksandar Pasaric

What are 3 types of buffers?

Types of buffer solutions (a) Acidic Buffer: It is formed by the mixture of weak acid and its salt with a strong base. ... (b) Basic Buffer: It is formed by the mixture of a weak base and its salt with strong acid. ... (c) Simple Buffer: ... (a) Acidic Buffer: ... (b) Basic Buffer:

byjus.com - Buffer - Chemistry - Definition, Types, Examples, Buffer Actions ... - Byjus
Why social media marketing is powerful?
Why social media marketing is powerful?

Build Brand Authenticity Engaging on social media gives brands the opportunity to build trust with potential customers, partners and...

Read More »
Last updated Oct 17, 2020
How do I enable live on Instagram?
How do I enable live on Instagram?

How to go live on Instagram Tap the plus sign "+" icon in the top-right corner of the homepage. ... After tapping the plus sign or swiping left,...

Read More »
Last updated Jun 5, 2021

Buffer

What is Buffer in Chemistry?

A solution whose pH is not altered to any great extent by the addition of small quantities of either an acid or base is called buffer solution. Buffer is also defined as the solution of reserve acidity or alkalinity which resists change of pH upon the addition of a small amount of acid or alkali. Many chemical reactions are carried out at a constant pH. In nature, there are many systems that use buffering for pH regulation. For example, the bicarbonate buffering system is used to regulate the pH of blood, and bicarbonate also acts as a buffer in the ocean.

Table of Contents

Recommended videos

Characteristics of buffer solution

(i) It has a definite pH.

(ii) Its pH does not change on standing for long periods of time.

(iii) Its pH does not change on dilution.

(iv) Its pH is slightly changed by the addition of small quantity of an acid or base.

Types of buffer solutions

(a) Acidic Buffer:

It is formed by the mixture of weak acid and its salt with a strong base. Examples: (i) CH 3 COOH + CH 3 COONa, (ii) HCN + NaCN, (iii) Boric acid + Borax etc.

(b) Basic Buffer:

It is formed by the mixture of a weak base and its salt with strong acid. Examples: (i) NH 4 OH + NH 4 Cl, (ii) NH 4 OH + NH 4 NO3, (iii) Glycine + Glycine hydrochloride

(c) Simple Buffer:

It is formed by a mixture of acid salt and normal salt of a polybasic acid,

example Na 2 HPO 4 + Na 3 PO 4

Or a salt of weak acid and a weak base. Example: CH 3 COONH 4

Buffer Actions

(a) Acidic Buffer:

It is the mixture of CH 3 COOH and CH 3 COONa in aqueous solution.

CH 3 COOH ⇋ CH 3 COO– + H+ (incomplete dissociation)

CH 3 COONa → CH 3 COO– + Na+ (complete dissociation)

H 2 O ⇋ H+ + OH– (incomplete dissociation)

Action of acid: when a drop of stong acid (HCl) is added in the above buffer solution H+ ions combine with CH3COO- ions to form feebly ionised CH3COOH. Whose ionisation is further suppressed due to common ion effect. So pH of the solution unaltered.

Who is the king of insta?
Who is the king of insta?

Dan Bilzerian Dan Bilzerian, known to many as the 'King of Instagram' (he has over 6 million followers) is one of the internet's most curious...

Read More »
Last updated Aug 19, 2021
How can I get $50 today?
How can I get $50 today?

Other Ideas to Make $50 Fast Sell Gift Cards. Sell Your Old Tech. Credit Card Rewards. Fundrise. Groundfloor. TaskRabbit. Freelance Writing....

Read More »
Last updated Jul 24, 2022

Action of base: when a drop of strong base (NaOH) is added to the above buffer solution it react with free acid to form undissociated water molecules. So pH of the solution unaltered. CH 3 COOH + OH– ⇋ CH 3 COO– + H 2 O

(b) Basic Buffer:

It is the mixture of NH 4 OH and NH 4 Cl in aqueous solution.

NH 4 OH ⇋ NH 4 + + OH– (incomplete dissociation)

NH 4 Cl → NH 4 + + Cl– (complete dissociation)

H 2 O ⇋ H+ + OH– (incomplete dissociation)

Action of acid: when a drop of HCl is added, the added H+ ions combine with NH4OH to form undissociated water molecules. So the pH of buffer is unaffected. NH 4 OH + OH– ⇋ NH 4 + + H 2 O Action of base: when a drop of NaOH is added, the added OH– ions combine with NH 4 + ions to form feebly ionised NH 4 OH. It is further suppressed due to common ion effect. So the pH of buffer is unaffected.

Hendersion’s Equation (pH of buffer)

(a) Acidic Buffer:

It is a mixture of CH 3 COOH and CH 3 COONa

CH 3 COOH ⇋ CH 3 COO– + H+

CH 3 COONa → CH 3 COO– + Na+

By the law of chemical equilibrium, K a = {[CH 3 COO–] [H+]} / [CH 3 COOH]

∴ [H+] = {K a [CH 3 COOH]} / [CH 3 COO–]

Taking negative log both sides, we obtain that

– log[H+] = – log K a – log {[CH 3 COOH]/[CH 3 COO–]}

pH = pK a + log {[CH 3 COO–]/[CH 3 COOH]}

pH = pK a + log {[salt] / [acid]}

This equation is known as Hendersion’s Equation

How much is 20million?
How much is 20million?

Therefore 20 million equals 2 crores.

Read More »
Last updated May 4, 2021
How many views do you need to be verified?
How many views do you need to be verified?

Verified channel eligibility To be eligible to apply for verification, your channel must reach 100,000 subscribers. After you apply, we'll review...

Read More »
Last updated Oct 24, 2019

Where, K a = dissociation constant

3

3

(b) Basic Buffer:

It is a mixture of NH 4 OH and NH 4 Cl

NH 4 OH ⇋ NH 4 + + OH–

NH 4 Cl → NH 4 + + Cl–

By the law of chemical equilibrium, K b = {[NH 4 +] [OH–]} / [NH 4 OH]

∴ [OH–] = {K b [NH 4 OH]} / [NH 4 +]

Taking negative log both sides, we obtain that

– log [OH–] = – log K b – log {[NH 4 OH] / [NH 4 +]} pOH = pK b + log { [NH 4 +] / [NH 4 OH]}

pOH = pK b + log {[salt] / [base]}

This equation is known as Hendersion’s Equation

Where, K b = dissociation constant

4

4

pH + pOH = 14

Buffer capacity

Buffer capacity is defined as the number of moles of acid or base added in one litre of solution as to change the pH by unity. Buffer capacity (Φ) = No. of moles of acid or base added to 1 litre solution/change in pH

Φ = ∂b /∂(pH)

Where ∂b – No. of moles of acid or base added to 1 litre

∂(pH) – change in pH

Applications of Buffer in chemistry

(i) Buffers are used in industrial processes such as manufacture of paper, dyes, inks, paints, drugs, etc. (ii) Buffers are also employed in agriculture, dairy products and preservation of various types of foods and fruits. (iii) It is used to determine the pH with the help of indicators. (iv) Blood is the natural buffer, it maintenance of pH is essential to sustain life because enzyme catalysis is pH sensitive process. The normal pH of blood plasma is 7.4. (v) For the removal of phosphate ion in the qualitative inorganic analysis after the second group using CH 3 COOH + CH 3 COONa buffer.

byjus.com - Buffer - Chemistry - Definition, Types, Examples, Buffer Actions ... - Byjus
What is $400 a week hourly?
What is $400 a week hourly?

$10 per hour If you earn $400 for a 40-hour week, your dollar-to-hour ratio is 10-to-1 (or $10 per hour). Mar 17, 2022

Read More »
Last updated Nov 6, 2020
What are the differences new and old media?
What are the differences new and old media?

The Difference Between Traditional Media vs. New Media. Traditional media involves businesses targeting a large audience via billboards, print ads,...

Read More »
Last updated Apr 20, 2018
What type of athlete is in the best shape?
What type of athlete is in the best shape?

Which Type of Athletes are the Fittest? Boxers and Mixed Martial Artists. Boxers have extremely high fitness levels. ... American Football Players....

Read More »
Last updated Feb 20, 2018
How many followers do you need to be a celebrity?
How many followers do you need to be a celebrity?

Celebrity influencers are classified as creators who have 1,000,000+ subscribers on YouTube, 2,500,000+ followers on Instagram, and 2,500,000+...

Read More »
Last updated Oct 5, 2019