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
laiz [17]
3 years ago
8

In the laboratory a student combines 26.2 mL of a 0.234 M chromium(III) acetate solution with 10.7 mL of a 0.461 M chromium(III)

nitrate solution. What is the final concentration of chromium(III) cation ?
Chemistry
1 answer:
Natalka [10]3 years ago
5 0

<u>Answer:</u> The molarity of Cr^{3+} ions in the solution is 0.299 M

<u>Explanation:</u>

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}    .....(1)

  • <u>For chromium (III) acetate:</u>

Molarity of chromium (III) acetate solution = 0.234 M

Volume of solution = 26.2 mL

Putting values in equation 1, we get:

0.234=\frac{\text{Moles of chromium (III) acetate}\times 1000}{26.2}\\\\\text{Moles of chromium (III) acetate}=\frac{0.234\times 26.2}{1000}=0.00613mol

1 mole of chromium (III) acetate (Cr(CH_3COO)_3) produces 1 mole of chromium (Cr^{3+}) ions and 3 moles of acetate (CH_3COO^-) ions

Moles of Cr^{3+}\text{ ions}=(1\times 0.00613)=0.00613moles

  • <u>For chromium (III) nitrate:</u>

Molarity of chromium (III) nitrate solution = 0.461 M

Volume of solution = 10.7 mL

Putting values in equation 1, we get:

0.461=\frac{\text{Moles of chromium (III) nitrate}\times 1000}{10.7}\\\\\text{Moles of chromium (III) nitrate}=\frac{0.461\times 10.7}{1000}=0.00493mol

1 mole of chromium (III) nitrate (Cr(NO_3)_3) produces 1 mole of chromium (Cr^{3+}) ions and 3 moles of nitrate (NO_3^-) ions

Moles of Cr^{3+}\text{ ions}=(1\times 0.00493)=0.00493moles

  • <u>For chromium cation:</u>

Total moles of chromium cations = [0.00613 + 0.00493] = 0.01106 moles

Total volume of solution = [26.2 + 10.7] = 36.9 mL

Putting values in equation 1, we get:

\text{Molarity of }Cr^{3+}\text{ cations}=\frac{0.01106\times 1000}{36.9}\\\\\text{Molarity of }Cr^{3+}\text{ cations}=0.299M/tex]Hence, the molarity of [tex]Cr^{3+} ions in the solution is 0.299 M

You might be interested in
Jim can jog 800 m in 16 minutes. How many meters can he jog<br> in a minute?
RSB [31]

Answer: 50 meters

Explanation:

5 0
3 years ago
___________ is a characteristic of a substance that's observed during a chemical reaction. *
Tju [1.3M]
Chemical property. Chemical property refers to the characteristic changed
3 0
3 years ago
How many carbon atoms would be in the compound named chlorobenzene
kondaur [170]

chlorobenzene
Carbon - 6
Hydrogen - 5
Chlorine - 1

that 1 chlorine replaces one of the hydrogens
thats why hydrogen number decreases by number of Cl atoms (that are substituting those H atoms)
7 0
3 years ago
On x
Lena [83]

Answer:

2

Explanation:

1+1=2

6 0
2 years ago
What definition BEST describes a watershed?
stellarik [79]

Answer:

An area or ridge of land that separates waters flowing to different rivers, basins, or seas.  

Explanation:

7 0
3 years ago
Other questions:
  • He dissolution of gases in water is virtually always exothermic because __________. a gases react exothermically with water b th
    9·1 answer
  • Calcium chloride contains only calcium and chloride. What is the formula for this compound?
    13·2 answers
  • What thorium has 90 protons and 137 neutrons?
    7·2 answers
  • An "arid" climate is very hot and dry.<br><br> True | False
    13·2 answers
  • A swimming pool measures 45.0 meters by 30.0 meters. How many grams of water are needed to fill the pool, whose average depth is
    8·2 answers
  • If you put a plant across the room from a window, how will this affect the growth of the plant?
    7·1 answer
  • Help me it’s science
    13·2 answers
  • Its gelatin and a fruit cup the same (its for a project)
    10·2 answers
  • The volume of a sample of nitrogen gas at a temperature of 291K and 1.0 x 105 Pascals was 3.5 x 10-2m3. Calculate the temperatur
    7·1 answer
  • An atom has 18 neutrons and 17 proton. a) How many electrons are in this atom ​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!