1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tatiana [17]
2 years ago
13

You need to prepare 1 L of the citric acid/citrate buffer. You have chosen to use Method 1 (see lab presentation). Calculate the

pH of a solution prepared by mixing 300 mL of 0.45 M citric acid acid and 100 mL of 0.65 M NaOH plus water to a final volume of one liter. The Ka of citric acid is 7.24 x 10-4.
Chemistry
1 answer:
prisoha [69]2 years ago
8 0

Answer:

3.11 is the pH of the buffer

Explanation:

The pH of a buffer is obtained using H-H equation:

pH = pKa + log [Conjugate base] / [Weak acid]

<em>Where pH is the pH of the buffer, pKa = -log Ka = 3.14 for the citric buffer and [] could be taken as the moles of each species.</em>

The citric acid,HX (Weak acid), reacts with NaOH to produce sodium citrate, NaX (weak base) and water:

HX + NaOH → H2O + NaX

That means the moles of NaOH added = Moles of sodium citrate produced

And the resulitng moles of HX = Initial moles - Moles NaOH added

<em>Moles HX and NaX:</em>

Moles NaOH = 0.100L * (0.65mol / L) = 0.065 moles NaOH = Moles NaX

Moles HX = 0.300L * (0.45mol / L) = 0.135 moles HX - 0.065 moles NaOH = 0.070 moles HX

Replacing in H-H equation:

pH = 3.14 + log [0.065mol] / [0.070mol]

pH = 3.11 is the pH of the buffer

You might be interested in
The periodic table
astra-53 [7]

it's Lithium or Li

..............................

5 0
3 years ago
Read 2 more answers
How many inches are in 25.8 cm
NeTakaya

Answer:

10.1574803 inches

Explanation:

Here you go

6 0
3 years ago
Calculate the number of liters in 3.25 g of ammonia
il63 [147K]

 The liters in   3.25 g   of  ammonia  4.28 L


  <u><em>calculation</em></u>

 Step 1: find moles of ammonia

 moles = mass÷ molar  mass

 From  periodic    table  the molar mass  of ammonia (NH₃)  =  14 +(1×3 ) = 17  g/mol

3.25 g÷ 17 g/mol = 0.191   moles

Step 2: find the number of liters of ammonia

 that is at STP  1  moles = 22.4 L

                        0.191 moles = ? L

<em>by cross  multiplication</em>

 ={( 0.191   moles  ×22.4 L) / 1 mole}  = 4.28 L



8 0
3 years ago
Read 2 more answers
A 7.2 L balloon at 2 atm of pressure has its pressure reduced to 0.5 atm. What is the new size of the balloon, in liters?
alexgriva [62]

Explanation:

using Boyles law: which shows the relationship between pressure and volume, when temperature Is kept constant

P1V1 = P2V2

2 x 7.2 = 0.5 x V2

14.4 = 0.5 x V2

V2 = 14.4/0.5 = 28.8 L

Hence the new size of the balloon in litres is 28.8

8 0
3 years ago
Which of the following is a chemical property of a sheet of paper?
Tomtit [17]

Answer:

A

Explanation:

Flammability is a chemical property. The paper crumbling would be a physical property. The inability to attract a magnet or conduct electricity would be considered electrical properties

3 0
2 years ago
Other questions:
  • Please help!
    15·1 answer
  • What’s the PH and OH- of 6.0 x 10^-10?
    6·1 answer
  • How are an earthquake's epicenter and focus related
    15·1 answer
  • Is water wet? I give you a lot of points
    13·2 answers
  • Ow doe the respiratory system work? (Use 3-5 sentences to explain how the respiratory system works.)
    14·2 answers
  • what is the anode of a galvanic cell made with zinc and aluminum aluminum metal zinc metal aluminum ions zinc ions​
    12·2 answers
  • How many molecules are contained in 125 grams of water, H20?
    8·2 answers
  • Complete the following table based on known properties of ionic and covalent compounds.
    7·1 answer
  • Why cant you see individual atoms without a special tool​
    14·2 answers
  • Mixing agno3 and nacl will produce what white precipitate.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!