Question

A beaker contains 1.0 M NaOH(aq) solution. To produce a NaOH(aq) solution of molar concentration 0.20 M, we transfer 2.0 ml (cm^3) out of this beaker into a 25 ml cylinder and add distilled water until the total volume reading becomes

A) 12ml
B)10ml
C)8ml
D)5ml
E)2ml

Answer 1

Answer: B) 10 ml

Step-by-step explanation:

According to the dilution law,

`M_1V_1=M_2V_2`

where,

`M_1` = molarity of stock
`NaOH` solution = 1.0 M

`V_1` = volume of stock
`NaOH` solution = 2.0 ml

`M_1` = molarity of dilute
`NaOH` solution = 0.20 M

`V_1` = volume of diluted
`NaOH` solution = ?

Putting in the values we get:

`1.0* 2.0=0.20* V_2`

`V_2=10ml`

Therefore, final volume reading is 10 ml