Question

(On the verge of tears)

Calculate the final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water. Use M1V1 =M2V2. Round up answer to
the hundredths. Include unit.

Answer 1

Answer: The final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water is 0.22 M

Step-by-step explanation:

According to the dilution law,

`M_1V_1=M_2V_2`

where,

`M_1` = molarity of stock solution = 1.3 M

`V_1` = volume of stock solution = 20 ml

`M_1` = molarity of diluted solution = ?

`V_1` = volume of diluted solution = (20+100) ml = 120 ml

Putting in the values we get:

`1.3* 20=M_2* 120`

`M_2=0.22M`

Therefore the final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water is 0.22 M