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
Radda [10]
3 years ago
12

15 POINTS PLEASE HELP What volume of water must be added to 35mL of 2.6m KCl to reduce its concentration to 1.2m? Please explain

, as I have a quiz on this tomorrow and I really don't get this. Thanks so much!!
Chemistry
1 answer:
BartSMP [9]3 years ago
5 0
First, find the volume the solution needs to be diluted to in order to have the desired molarity:
You have to use the equation M₁V₁=M₂V₂ when ever dealing with dilutions.

M₁=the starting concentration of the solution (in this case 2.6M)
V₁=the starting volume of the solution (in this case 0.035L)
M₂=the concentration we want to dilute to (in this case 1.2M)
V₂=the volume of solution needed for the dilution (not given)

Explaining the reasoning behind the above equation:
MV=moles of solute (in this case KCl) because molarity is the moles of solute per Liter of solution so by multiplying the molarity by the volume you are left with the moles of solute.  The moles of solute is a constant since by adding solvent (in this case water) the amount of solute does not change.  That means that M₁V₁=moles of solute=M₂V₂ and that relationship will always be true in any dilution.

Solving for the above equation:
V₂=M₁V₁/M₂
V₂=(2.6M×0.035L)/1.2M
V₂=0.0758 L
That means that the solution needs to be diluted to 75.8mL to have a final concentration of 1.2M.

 Second, Finding the amount of water needed to be added:
Since we know that the volume of the solution was originally 35mL and needed to be diluted to 75.8mL to reach the desired molarity, to find the amount of solvent needed to be added all you do is V₂-V₁ since the difference in the starting volume and final volume is equal to the volume of solvent added.
75.8mL-35mL=40.8mL
40.8mL of water needs to be added

I hope this helps.  Let me know if anything is unclear.
Good luck on your quiz!
You might be interested in
What kind of electrons are involved in chemical bonding?
mamaluj [8]
Bonding electrons are involved in chemical bonding these electrons have their valnce shell incomplete
6 0
3 years ago
Activity In this activity, you’ll draw and count atoms to understand how nitrogen and hydrogen react to make ammonia. Begin by s
vredina [299]

Answer:

Explanation:

3 0
2 years ago
What is the total number of atoms in this formula?<br> NaHCO3
Pavel [41]
6 - one sodium atom, 1 hydrogen atom, 1 carbon atom, and 3 oxygen atoms.


7 0
3 years ago
List three things that rely on the Sun as the major source of energy​
valkas [14]

Answer:

Three things that rely on the sun for energy is coal,oil, and natural gases

Explanation:

We use engery too cook our food that's an example of how gases are used.

We run our cars .Cars use oil.

And we use electricity for lights. You need coal for the electricity

6 0
2 years ago
Read 2 more answers
Why does a raindrop accelerate as it falls to the earth?
allochka39001 [22]
Acceleration is the rate at which an object changes its speed. When a raindrop is falling down from the clouds due to gravity, the veloicty is pretty much fast, however air resistance comes in action and slows the droplet down... it gives it a constant speed until it hits the ground

6 0
2 years ago
Read 2 more answers
Other questions:
  • What is the pH of a 0.1 M acid solution?<br><br> a) 0<br><br> b) -1<br><br> c) 1
    15·2 answers
  • Help ASAP! I'm kind of stuck on what you are supposed to put for theoretical / predicted yield and what is the actual yield for
    8·1 answer
  • How is natural gas power formed? :)
    13·1 answer
  • Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a
    10·1 answer
  • Identify the trend in bond length of the hydrogen-halide molecule and explain why it exists.​
    13·1 answer
  • What is the pH of a solution of KOH with a hydroxide concentration of [OH⁻] = 1.10 x 10⁻⁴
    6·1 answer
  • Examples of fossil fuels are
    8·1 answer
  • Write the name for the compound whose formula is shown here<br><br> Ca3(BO3) 2
    11·1 answer
  • Which transfers thermal energy in the same way the Suns energy is transferred to Earth?
    12·1 answer
  • Based on the parameters set forth in your lab procedure, what is the ph you should observe when you added the hcl to water?.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!