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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

Respuesta :

Answer: a) 5.0 ml

b) 4.0 ml

c) 3.0 ml

d) 2.0 ml

e) 0.50 ml

Explanation:

According to the dilution law:

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of stock solution = [tex]7.0\times 10^{-5}[/tex] M

[tex]V_1[/tex] = volume of stock  solution = ?

[tex]M_2[/tex] = molarity of diluted solution =  [tex]3.5\times 10^{-5}[/tex] M

[tex]V_2[/tex] = volume of diluted  solution = 10.00 ml

[tex]7.0\times 10^{-5}\times V_1=3.5\times 10^{-5}\times 10.00[/tex]

[tex]V_1=5.0ml[/tex]

b) [tex]2.8\times 10^{-5}[/tex] M

[tex]7.0\times 10^{-5}\times V_1=2.8\times 10^{-5}\times 10.00[/tex]

[tex]V_1=4.0ml[/tex]

c)  [tex]2.1\times 10^{-5}[/tex] M

[tex]7.0\times 10^{-5}\times V_1=2.1\times 10^{-5}\times 10.00[/tex]

[tex]V_1=3.0ml[/tex]

d)  [tex]1.4\times 10^{-5}[/tex] M

[tex]7.0\times 10^{-5}\times V_1=1.4\times 10^{-5}\times 10.00[/tex]

[tex]V_1=2.0ml[/tex]

e) [tex]3.5\times 10^{-6}[/tex] M

[tex]7.0\times 10^{-5}\times V_1=3.5\times 10^{-6}\times 10.00[/tex]

[tex]V_1=0.50ml[/tex]

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