Question

How many milliliters of 2.55M NaOH is needed to make 125mL of 0.75M NaOH solution??

Answer 1

as i am reading the problem, i notice they give two concentrations (M), a volume and asking for the other volume; this should be a hint that we need to use the dilution formula---> M1V1 = M2V2

M1= 2.55 M
V1= ?
M2= 0.75 M
V2= 125 mL

now, we plug in the values into the formula

(2.55 x V1) = (0.75 x 125)

V1= 36.8 mL

Answer 2

36.7 milliliters of 2.55M NaOH will be needed

Step-by-step explanation:

Molarity of NaOH solution =
`M_1=2.55 M`

`V_1=?`

Molarity of 125 mL NaOH solution =
`M_2=0.75 M`

`V_2=125 mL = 0.125 L`

Using dilution formula :

`M_1V_1=M_2V_2`

`2.55 M * V_1=0.75 M* 0.125 L`

`V_1=0.0367 L = 36.7 mL`

36.7 milliliters of 2.55M NaOH will be needed