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
Shalnov [3]
3 years ago
5

Suppose you are working with a NaOH stock solution but you need a solution with a lower concentration for your experiment. Calcu

late the volume of the 1.224 M stock NaOH solution needed to prepare 250.0 mL of 0.1281 M dilute NaOH solution.
Chemistry
1 answer:
Monica [59]3 years ago
7 0

Answer: The volume of the 1.224 M NaOH solution needed is 26.16 mL

Explanation:

In order to prepare the dilute NaOH solution, solvent is added to a given amount of the NaOH stock solution up to a final volume of 250.0 mL.

Since only solvent is added, the amount of the solute, NaOH, in the dilute solution is the same as in the volume taken from the stock solution.

Molarity (<em>M)</em> is calculated from the following equation:

<em>M</em> = <em>n</em> ÷ <em>V</em>

where <em>n</em> is the number of moles of the solute in the solution, and <em>V</em> is the volume of the solution.

Accordingly, the number of moles of the solute is given by

<em>n</em> = <em>M</em> x <em>V</em>

Now, let's designate the stock NaOH solution and the dilute solution as (1) and (2), respectively . The number of moles of NaOH in each of these solutions is:

<em>n </em>(1) = <em>M </em>(1) x <em>V </em>(1)

<em>n </em>(2) = <em>M </em>(2) x <em>V </em>(2)

As the amount of NaOH in the dilute solution is the same as in the volume taken from the stock solution,

<em>n</em> (1) = <em>n</em> (2)

and

<em>M</em> (1) x <em>V</em> (1)<em> </em>= <em>M</em> (2) x <em>V</em> (2)

For the stock solution, <em>M</em> (1) = 1.244 M, and <em>V</em> (1) is the volume needed. For the dilute solution, <em>M</em> (2) = 0,1281 M, and <em>V</em> (2) = 250.0 mL.

The volume of the stock solution needed, <em>V</em> (1), is calculated as follows:

<em>V</em> (1) = <em>M</em> (2) x <em>V</em> (2) ÷ <em>M</em> (1)

<em>V</em> (1) = 0.1281 M x 250.0 mL ÷ 1.224 M

<em>V </em>(1) = 26.16 mL

The volume of the 1.224 M NaOH solution needed is 26.16 mL.

You might be interested in
Convert .0027 CL to mL.
Over [174]

Answer:

0.027 ml

Explanation:

1\:cl = 10\:ml\\0.0027 \:  cl = x\:ml

Cross Multiply

x = 0.027 \:ml

4 0
3 years ago
What is the name for the chemical compound NaBr and is it ionic or covalent
DochEvi [55]

Answer: Sodium bromide is an ionically bonded compound.

(NaBr: Sodium Bromide)

8 0
2 years ago
What gives the gem amethyst its purplish color?
Alina [70]
iron Presence of trace elements, irradiation and iron impurities give the gem amethyst its purplish color!
7 0
3 years ago
I need the answer to 452 of arogon
yaroslaw [1]
I'm confused... is there more info? 
3 0
3 years ago
Based on the table, which do you think is larger – your direct water use or your indirect water use?
Pavlova-9 [17]

Answer:

your indirect water use.

5 0
3 years ago
Other questions:
  • Rank the following solutions from least polar to most polar. Rank on a scale of 1-4: 1 being the least polar and 4 being the mos
    14·1 answer
  • Which of the following is the correct Lewis structure diagram for Neon? The letters Ne with eight dots The letters Ne with seven
    5·2 answers
  • Devibel is a measurement of the amout of pollution.<br> True or false
    13·1 answer
  • In a certain experiment 10.0g of magnesium nitride is allowed to react with 5.00 g of water. Calculate the final mass of ammonia
    8·1 answer
  • If 60.0 ml of a 1.5 m hcl solution is put into a flask and diluted with water to make 2.0 l of solution
    15·1 answer
  • PLEASE HELP
    8·1 answer
  • Raina is ready to start taking photographs at a crime scene after she secured the crime scene. Which photos should she take firs
    15·1 answer
  • Which of the following is necessary for photosynthesis?
    15·1 answer
  • What are the [H+] and [OH-] for a substance with a pH of 9.2? Show work please
    14·1 answer
  • Research help?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!