Question

You will need to have the following calculations prepared for the lab. Calculate how many mL of the 7.0 × 10−5 M Allura Red stock solution will be needed to prepare 10.00 mL of the following solutions. Show your work for one example. 3.5 × 10−5 M 2.8 × 10−5 M 2.1 × 10−5 M 1.4 × 10−5 M 3.5 × 10−6 M

Answer 1

Answer: a) 5.0 ml

b) 4.0 ml

c) 3.0 ml

d) 2.0 ml

e) 0.50 ml

Step-by-step explanation:

According to the dilution law:

`M_1V_1=M_2V_2`

where,

`M_1` = molarity of stock solution =
`7.0* 10^(-5)` M

`V_1` = volume of stock solution = ?

`M_2` = molarity of diluted solution =
`3.5* 10^(-5)` M

`V_2` = volume of diluted solution = 10.00 ml

`7.0* 10^(-5)* V_1=3.5* 10^(-5)* 10.00`

`V_1=5.0ml`

b)
`2.8* 10^(-5)` M

`7.0* 10^(-5)* V_1=2.8* 10^(-5)* 10.00`

`V_1=4.0ml`

c)
`2.1* 10^(-5)` M

`7.0* 10^(-5)* V_1=2.1* 10^(-5)* 10.00`

`V_1=3.0ml`

d)
`1.4* 10^(-5)` M

`7.0* 10^(-5)* V_1=1.4* 10^(-5)* 10.00`

`V_1=2.0ml`

e)
`3.5* 10^(-6)` M

`7.0* 10^(-5)* V_1=3.5* 10^(-6)* 10.00`

`V_1=0.50ml`