CHEM 241L Calculations

Experiment 4: Corrected Total Volume Concentration

V + (C) * (V/0.5mL) = CV

Experiment 4: Amount of Strong Acid/Base Added Calculation

(CV/1000mL) * M = mol

Experiment 4: Formal Concentration of Strong Acid/Base Added Calculation

mol/(V+20mL/1000mL) = F

Experiment 4: Buffer Capacity Calculation

|(F2-F1)/(pH2-pH1)|

Experiment 3: Change in pH Calculation

pH2-pH1 = dpH

Experiment 3: Change in Absorbance Calculation

A2-A1 = dA

Experiment 3: Average pH Calculation

(pH2+pH1)/2 = Average pH

Experiment 3: Change in Absorbance over Change in pH Calculation 

(A2-A1)/(pH2-pH1) = dA/dpH

Experiment 3: Bromothymol Blue Acidic and Basic Forms pKa Calculation 

(Left estimate + Right estimate)/2 = estimated pKa

Experiment 3: Bromothymol Blue pKa Calculation 

(Acidic Form Estimate + Basic Form Estimate)/2 = pKa

Experiment 3: Percent Error Calculation for Observed pKa vs. Literature pKa Value 

|(Observed-Actual)/Actual| * 100 = Percent Error 

Experiment 1: Sample Percentage Calculation

(p-b)/m = x

Experiment 1: Partition Coefficient Calculation

Ethanol (org) / Ethanol (aq) = K

Experiment 1: % Ethanol Calculation:

b/m = |x|

Experiment 6: Original Undiluted Concentration of Glucose Calculation 

C = (((A - y-int)/m) * 50 * 5)/.25

Experiment 6: Original Undiluted Concentration of Digested Solutions

C = (((A - y-int)/m) * 25 * 5)/.25

Experiment 6: Total Sugars Concentration Calculation

C = g/L

Experiment 6: Standard Deviation

sqrt((x - M)²/(n-1))

Experiment 5: Relative Retention Value Calculation

(tr2 - tm)/(tr1-tm) = alpha 

Experiment 5: Width Calculation

R - L = W

Experiment 5: Resolution Calculation

2(tr2-tr1)/(w2 + w1) = R