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
solmaris [256]
3 years ago
11

A series of five calibration standards 25, 50, 75 and 100 mg/L Potassium is required to be made from a 1000mg/L Potassium standa

rd solution. If the final volume of the calibration standards is 100 mL, what is the required volume of the 1000 mg/L Potassium standard solution?
Chemistry
1 answer:
Julli [10]3 years ago
4 0

Answer : The volume required is, 25 mL

Explanation :

First we have to determine the mass of potassium present in 100 mL or 0.1 L of each standards.

<u>For 25 mg/L :</u>

As, 1 L volume has mass of potassium = 25 mg

So, 0.1 L volume has mass of potassium = 0.1\times 25=2.5mg

<u>For 50 mg/L :</u>

As, 1 L volume has mass of potassium = 50 mg

So, 0.1 L volume has mass of potassium = 0.1\times 50=5.0mg

<u>For 75 mg/L :</u>

As, 1 L volume has mass of potassium = 75 mg

So, 0.1 L volume has mass of potassium = 0.1\times 75=7.5mg

<u>For 100 mg/L :</u>

As, 1 L volume has mass of potassium = 100 mg

So, 0.1 L volume has mass of potassium = 0.1\times 100=10mg

Now we have to determine the total mass of potassium.

Total mass of potassium = 2.5 + 5.0 + 7.5 + 10 = 25 mg

Now we have to determine the required volume of the 1000 mg/L Potassium standard solution.

As, 1000 mg mass of potassium present in 1 L volume

So, 25 mg mass of potassium present in \frac{25}{1000}=0.025L volume

Volume required = 0.025 L = 25 mL     (conversion used : 1 L = 1000 mL)

Therefore, the volume required is, 25 mL

You might be interested in
How can chemical changes be detected
saul85 [17]
Rarely they can't with just sight. Certain tests or experiments should take place
7 0
3 years ago
How many moles of NH3 can be produced from 30.0 mol of H2 and excess N2?
VMariaS [17]
20 mol of NH, can be produce from 30 mol o H2
6 0
3 years ago
Matching
kotegsom [21]

Answer:

a mixture of molecules - Box f

atoms of a pure elementa metal - Box D

a solid compound - Box C

a mixture of elements - Box A

Explanation:

Box a has mixture of elements which forms a solid like shape but there are different elements present in the box. The box f has mixture of molecules in which many atoms are combined together. Box c has solid compound with single element.

5 0
3 years ago
Write the complete balanced equation for the reaction between CaCO3 and KCI
EleoNora [17]

CaCO3 + 2KCL ⇒ CaCl2 + K2CO3

It is balanced as so based on the charges given on the periodic table and polyatomic ions.

Calcium has the charge of 2 but CO3 also shares the same charge, thus cancelling that out.

Potassium has a charge of 1 while Chlorine also shares a charge of 1, also cancelling it out.

Thus, if it performs a double replacement reaction, they would take these charges to the new elements that do not cancel out their charges.

Therefore, we need the coefficient of 2 in front of Potassium Chloride in order to balance the equation as on the products side of the equation, Potassium and Chlorine both have a subscript of 2.

Hope this helps!

5 0
3 years ago
A second reaction mixture was made up in the following way:
Leya [2.2K]

A. We can calculate the initial concentrations of each by the formula:

initial concentration ci = initial volume * initial concentration / total mixture volume

where,

total mixture volume = 10 mL + 20 mL + 10 mL + 10 mL = 50 mL

ci (acetone) = 10 mL * 4.0 M / 50 mL = 0.8 M

ci (H+) = 20 mL * 1.0 M / 50 mL = 0.4 M   (note: there is only 1 H+ per 1 HCl)

ci (I2) = 10 mL * 0.0050 M / 50 mL = 0.001 M

 

B. The rate of reaction is determined to be complete when all of I2 is consumed. This is signified by complete disappearance of I2 color in the solution. The rate therefore is:

rate of reaction = 0.001 M / 120 seconds

rate of reaction = 8.33 x 10^-6 M / s

6 0
3 years ago
Other questions:
  • Which is the smallest number?
    12·1 answer
  • Beaux has purchased a synthetic material for a product he is launching. What is most likely a benefit of this material? A) It is
    15·2 answers
  • In Section 5.6, we learned that triple bonds are stronger and shorter than single bonds. For example, a C−CC−C single bond has a
    15·1 answer
  • What is the process called when a solid turns to a gas
    14·2 answers
  • What mass of NaOH must be used to prepare 2.5 L of a 0.010 M solution
    10·1 answer
  • What is the pOH of a solution of HNO3 that has [OH-] = 9.50 10-9 M?
    5·2 answers
  • 8. When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. I
    9·1 answer
  • What are the properties of salt
    6·2 answers
  • The fermentation of C6H12O6 will produce carbon dioxide and
    15·1 answer
  • Bicycles that have been left outside in the summer will rust faster than bicycles kept inside. What causes the bicycles that are
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!