You\'re going to make solutions. The first solution you will make will be the st

Question

You're going to make solutions. The first solution you will make will be the stock solution and it needs to be 8.0 M NaCl. From the stock solution, you'll make the second solution which will have a concentration of 4.8 M. From this second solution, you make the third solution which will have a concentration of 1.5 M. You'll need to make a total of 100 mL of the third solution. Do the necessary calculations and then write a short procedure for this. What you have to use: -NaCl solid Water 50 mL volumetric flasks 100 mL volumetric flasks 250 mL volumetric flasks 10 mL graduated cylinders 100 mL graduated cylinders Beakers of all sizes M_1V_1 = M_2 V_2 M_1 = 8.0M V_1 = 50 mL M_2 = 4.8M v_2 = ? (8)(0.05) = (4.8)(V) 0.4 = 4.8 V_2 V_2 = 0.0833 L = 83.3 m

Explanation / Answer

Given

stock solution is 8.0 M of NaCl

M1 = 8 M = 8 mol/L

V1 = ?

Given we have to make second solution of 4.8 M and third solution 1.5 M and 100 ml

M3 = 1.5 M = 1.5 mol/L

V3 = 100 ml = 0.1 L

M1 * V1 = M3 * V3

8 mol/L * V1 = 1.5 mol/L * 0.1 L

V1 = 0.01875 L = 18.75 ml

V2 * M2 = V1 * M1

V2 * 4.8 mol/L = 0.01875 L * 8 mol/L

V2 = 0.03125 L = 31.25 L

First solution 18.75 ml and 8 M

second solution 31.25 ml and 4.8 M

Third solution 100 ml and 1.5 M

Procedure:

so we have to take 18.75 ml of stock solution using 10 ml graduated cylinder and pour it in 100 ml graduated cylinder

or we can take 18.75 ml of stock solution directly in 100 ml of graduated cylinder and keep it in a seperate beaker

this will be first solution

seccond solution

you follow the same procedure by taking 18.75 ml of stock solution in 100 ml of graduated cylinder

then add distilled water in cylinder upto the mark reaches 31.25 ml

seccond solution is ready pour it in beaker

third solution

take 18.75 ml of stock solution in 100 ml graduated cylinder

add water upto 100 ml mark and your third solution is ready

pour it in seperate beaker

so now your solution of different molarities are ready in different beakers

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.