Titration of Acids and Bases Experiment 20 Titration of Acids and Bases CHE118

In Lab Work in groups of 4 2 people for Part A; standardization of the prepared solution of NaOH 2 people for Part B; analysis of an unknown acid Each student does their own calculations after sharing data CHE118

Part A NaOH solution is already prepared, 0.1 M Do not boil any water Standardize the NaOH solution to find the next significant figure for molarity 0.1? M (If you use the 0.001 g balance, then you will have 3 SF for the molarity, 0.1? ? M) CHE118

Part B Do not boil any water There is no weighing bottle; use weighing paper Use the molarity determined in Part A for calculations in Part B CHE118

Parts A and B Buret readings have 2 SF after the decimal point 14.18 mL Obtain volume by difference for titrant (final – initial) CHE118

YouTube Videos How to Titrate NAIT Chemical Technology Laboratory Techniques CarolinaBiologicals Both are good videos on how to do a titration CHE118

Calculations Part A moles NaOH → Molarity NaOH; M = moles / L g KHP → moles KHP → moles NaOH → M NaOH g → moles; use molecular weight of KHP moles KHP → moles NaOH; use coefficients in balanced chemical equation moles NaOH → Molarity NaOH; M = moles / L CHE118

Calculations Part B CHE118

Calculations Part B (continued) mL NaOH → moles NaOH → moles KHP → g KHP → % KHP mL NaOH → moles NaOH; M x L = moles, use M from Part A moles NaOH → moles KHP; use coefficients in balanced chemical equation moles KHP → g KHP; use molecular weight of KHP g KHP → % KHP CHE118