lab .docx

# lab .docx - Post Lab 7 Calculations 1 Calculate the average...

• Lab Report
• 4

This preview shows pages 1–3. Sign up to view the full content.

Post Lab # 7 Calculations: 1. Calculate the average molarity of the NaOH solution from your three standardization trials. M NaOH = moles KHPh/ V NaOH in liters Flask One: (0.381 g KHPh/204.23 g/mol KHPh)/ (0.01699 liters NaOH) = 0.1098 mol/L NaOH Flask Two: (0.382 g KHPh/204.23 g/mol KHPh)/ (0.01699 liters NaOH) = 0.1100 mol/L NaOH Flask Three: (0.384 g KHPh/204.23 g/mol KHPh)/ (0..01723 liters NaOH) = 0.1.091 mol/L NaOH Average: [(0.1098 + 0.1100 + 0.1091) mol/L NaOH]/3 = 0.1096 mol/L NaOH 2. Calculations to determine the effectiveness of the antacid. a. Calculate the average number of moles of HCl neutralized per antacid tablet. Moles acid neutralized = (moles HCl added) - (moles NaOH for back titration) = (M HCl x V HCl ) – ( M NaOH x V NaOH ) Tums: Tablet One : [(1.0001 mol HCl/L) (0.01228 L HCl)] – [(0.1096 mol NaOH/L) (0.01742 L NaOH) ]= 0.0104 moles HCl Tablet Two : [(1.0001 mol HCl/L) (0.01199 L HCl)] – [(0.1096 mol NaOH/L) (0.01740 L NaOH)]= 0.0101 moles HCl Average number of moles of HCl for both trials: [(0.0104 + 0.0101) moles HCl] /2 = 0.0103 moles HCl Gelusil (Partner):

This preview has intentionally blurred sections. Sign up to view the full version.

Tablet One : [(1.0001 mol HCl/L) (0.00799 L HCl)] – [(0.1096 mol NaOH/L) (0.01690 L NaOH) ]= 0.0061 moles HCl Tablet Two : [(1.0001 mol HCl/L) (0.00799 L HCl)] – [(0.1096 mol NaOH/L) (0.01719 L NaOH)]= 0.0061 moles HCl Average number of moles of HCl for both trials: [(0.0061 + 0.0061)moles HCl]/2 = 0.0061 moles HCl b. Calculate the number of moles of HCl neutralized per gram of antacid (weight effectiveness). Tums: Tablet One: (0.0104 moles HCl/ 1.305 g) = 0.00797 moles HCl/g Tablet Two: (0.0101 moles HCl/ 1.330 g) = 0.00759 moles HCl/g Average: [(0.00797 + 0.00759) HCl/g]/ 2 = 0.00778 moles HCl/g Gelusil (Partner): Tablet One: (0.0061moles HCl/ 1.197 g) = 0.00510 moles HCl/g
This is the end of the preview. Sign up to access the rest of the document.
• Spring '12

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern