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
natka813 [3]
3 years ago
5

C. You wish to prepare 100 ml (total volume) of a buffer solution that is 0.025 m in carbonic acid, ph 7.25. You have solid h2co

3 and solid nahco3. Calculate how many grams of h2co3 and hco3- you need to weigh out to prepare this solution. Mass of h2co3 _________ g and mass of hco3- _________ g
Chemistry
1 answer:
erastova [34]3 years ago
6 0

Total volume required = 100mL

The concentration of carbonic acid = 0.025

Let concentration of sodium bi carbonate = [NaHCO3]

From Hendersen Hassalbalch's equation for buffers

pH = pKa + log [salt] / [acid]

pKa of carbonic acid = 6.35

7.25 = 6.35 + log [NaHCO3] / 0.025

0.9 = log [NaHCO3] / 0.025

Taking antilog

7.943 =  [NaHCO3] / 0.025

[NaHCO3]  = 7.943 X  0.025

[NaHCO3]  = 0.199 M

Volume is 100mL

Moles of NaHCO3 = molarity X volume (L) = 0.199 X 0.1 = 0.0199

Mass of NaHCO3 = moles X molar mass = 0.0199 X 84 = 1.672 g

moles of H2CO3 = molarity X volume (L) = 0.025 X 0.1 = 0.0025

Mass of H2CO3 = moles X molar mass = 0.0025 X 62 = 0.155 g

You might be interested in
Which of the following is an example of a chemical reaction?
FrozenT [24]
All of the above are chemical reactions.
If that is a choice 
6 0
3 years ago
What makes atoms different than<br> ions?
DENIUS [597]

Answer:the term 'atom' in chemistry represents the basic unit of matter that normally exists in a free state and contains all chemical properties. It is an infinite particle that clearly identifies a chemical element. It consists of a positively charged nucleus and is surrounded by negatively charged electrons.

An ion or charge is an atom or group of atoms that has lost or gained one or more electrons. An ion that has a negative charge, when it gains one or more electrons, is called an anion or negative charge, and an ion that has a positive charge when it loses one or more electrons, is called a cation or positive charge.

Explanation:

7 0
3 years ago
Read 2 more answers
Which has a higher average speed of molecules 95 degrees Celsius or 95 degrees Fahrenheit ​
shutvik [7]

Answer:

95(ninety five) degrees Celsius

6 0
3 years ago
Read 2 more answers
What is the correct name for the ionic compound, MgCl2?
algol [13]

Answer:

magnesium chloride (no prefixes)

8 0
3 years ago
Which solution has the lowest freezing point?
Leokris [45]
<span>Correct Answer: Option 3 i.e. 30 g of KI dissolved in 100 g of water.

Reason:
Depression in freezing point is a colligative property and it is directly proportional to molality of solution.

Molality of solution is mathematically expressed as,
Molality = </span>\frac{\text{Number of moles}}{\text{Weight of solvent (Kg)}}<span>

In case of option 1 and 2, molality of solution is 0.602 m. For option 3, molality of solution is 1.807 m, while in case of option 4, molality of solution is 1.205 m.

<u><em>Thus, second solution (option 2) has highest concentration (in terms of molality). Hence, it will have lowest freezing point</em></u></span>
3 0
4 years ago
Read 2 more answers
Other questions:
  • Does aluminum conduct electricity?
    9·1 answer
  • #1: Which of the following is likely to be a polar compound?
    8·1 answer
  • Calculate the percent composition of Mg(NO3)2.
    7·1 answer
  • For a 1.00 m ( 100 cm) crumble zone, how much deformation do you think is needed in order to keep the passenger the safest? Expl
    12·1 answer
  • The reaction between bromine gas and fluorine gas to create bromine monofluoride gas has reached equilibrium. what is the effect
    9·1 answer
  • What is the mass percent of oxygen in sodium bicarbonate (NaHCO3)?
    15·1 answer
  • How many lone pairs are on the central atom of a molecule of RnCl4?
    9·1 answer
  • A 8.5-liter sample of a gas has 1.2 mole of the gas. If 0.65 mole of the gas is added, what is the final volume of the gas? Temp
    14·2 answers
  • The weight of an object never changes.<br><br><br> A. True B. False
    5·2 answers
  • Calculate the pH of the following:
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!