Posted by **Aman** on Friday, November 16, 2007 at 12:14pm.

Volume of stock solution

a. 5.0mL b.10.0mL c.15.0mL d.20.0mL

Prepare 25mL of each of the four different dilute solution

Concentration of stock- 1.01E-5

Calculate molarity for a,b,c,d

Molarity=m1V1/V2

for a would the answer be 2.02E6?????

(1.01E-5)(5.0)/(25.0)

- Chem Urgent -
**DrBob222**, Friday, November 16, 2007 at 12:20pm
Yes, the answer is what you posted EXCEPT the exponenet is -6 and not +6. Also, you don't say if th e stock solution is molar, molal, or what. Your answer is ok if the stock solution is 1.01E-5 MOLAR

- Chem Urgent -
**Aman**, Friday, November 16, 2007 at 1:06pm
Its Molar. Thanks

- Chem Urgent -
**Aman**, Friday, November 16, 2007 at 2:04pm
If for a. the concentration is 2.02E-6, Wavelength at 630, Absorbance is .216, how would I find the %T.

- Chem Urgent -
**DrBob222**, Friday, November 16, 2007 at 3:56pm
Absorbance = 1/T OR 100/%T.

- Chem Urgent -
**DrBob222**, Friday, November 16, 2007 at 4:43pm
Use your calculator.

A = log (1/T)

0.216 = log (1/T)

1.644 = 1/T

T = 0.608

%T = 60.8%

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