Solutions1 2 3 4 5

mL Co 1.15 2.10 3.00 4.15 5.15mL H2O 4.20 2.95 2.10 1.05 0.00Final Volume (mL) 5.35 5.05 5.10 5.20 5.15Absorbance 0.175 0.346 0.466 0.655 0.824Concentration M 0.032 0.062 0.088 0.120 0.150

Concentration Calculations: Continued (Multiplying left side)Solution 1 (0.15 M)(1.15 mL)=( ? M )(5.35 mL) (0.1725M/mL)=( ? M )(5.35 mL)Solution 2 (0.15 M)(2.10 mL)=( ? M )(5.05 mL) (0..315M/mL)=( ? M )(5.05 mL)Solution 3 (0.15 M)(3.00 mL)=( ? M )(5.10 mL) (0.45M/mL)=( ? M )(5.10 mL)Solution 4 (0.15 M)(4.15 mL)=( ? M )(5.20 mL) (0.6225M/mL)=( ? M )(5.20 mL)Solution 5 (0.15 M)(5.15 mL)=( ? M) (5.15 mL) (0.7725M/mL)=( ? M )(5.15 mL)

Last Calculation. Divide Left side by volume on right to get Concentration. Correct Sig Figs.0.032 = M0.062 = M0.088 = M0.120 = M0.150 = M

Brendan Black

SolutionsUnknown

0.7060.129

Continued (Multiplying left side)(0.1725M/mL)=( ? M )(5.35 mL)(0..315M/mL)=( ? M )(5.05 mL)(0.45M/mL)=( ? M )(5.10 mL)

(0.6225M/mL)=( ? M )(5.20 mL)(0.7725M/mL)=( ? M )(5.15 mL)

Last Calculation. Divide Left side by volume on right to get Concentration. Correct Sig Figs.

0.020 0.040 0.060 0.080 0.100 0.120 0.140 0.1600

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f(x) = 5.486302618x - 0.0036395651R = 0.998910876

Absorbance vs. Concentration

Concentration

Absorba

nce Unknown

.706=5.4863x-.0036

.7096=5.4863x

.129=x

Sheet1Chart1