sing a primary standard to analyze acid and base solutions

Using a primary standard to analyze acid and base solutions Acid-base titration Lab 13G
Jake Shewchuk Lab 13C Dominique Genereux

Purpose 13G:
1. To prepare a standard solution of oxalic acid and use it to standardize an unknown sodium hydroxide solution.
Purpose 13C:
1. To titrate a hydrochloric acid solution of “unknown” concentration with standardized 0.5M sodium hydroxide.
2. To titrate a hydrochloric acid solution of “known” concentration with standardized 0.5M sodium hydroxide.
3. To titrate an acetic acid solution (vinegar) with standardized 0.5M sodium hydroxide.
4. To utilize the titration results to calculate the molarity of the hydrochloric acid and the molarity and percent composition of the vinegar.

Hypothesis 13G: N/A
Hypothesis 13C: N/A
Apparatus & Materials 13G: Please see page 217 in ESSENTIAL EXPERIMENTS for CHEMISTRY
Apparatus & Materials 13C: Please see page 196 in ESSENTIAL EXPERIMENTS for CHEMISTRY

Procedure 13G: Please see page 217 in ESSENTIAL EXPERIMENTS for CHEMISTRY
Procedure 13C: Please see page 196 in ESSENTIAL EXPERIMENTS for CHEMISTRY

Diagram 13G: N/A
Diagram 13C: N/A

Observation 13G:
Mass of NaOH = 10.836g

Table 1:oxalic acid
Calculated mass of oxalic acid dihydrate
3.150g
Mass of weigh boat (g)
.500g
Mass of weigh boat + oxalic acid (g)
3.662g
Mass of oxalic acid (g)
3.162g
Concentration of 100.00ml
.2510M

Table 2: NaOH
Mass of NaOH + weigh boat
11.336g
Mass of weigh boat
.500g
Calculated mass of NaOH
10.836g
Moles of NaOH
.2709mol
Concentration of 500.0ml NaOH
.5418M

Table 3: HCl
Volume of Concentrated HCl
10.00mL
Concentration diluted to 250.00ml
.5475M

Table 2: Volume of NaOH needed to neutralize 10.00 mL of oxalic acid

Trial 1
Trial 2
Initial reading of buret (mL)
16.39mL
9.89mL
Final reading of buret (mL)
25.98mL
19.50mL
Volume of NaOH required (mL)
9.59mL
9.61mL
Average Volume of NaOH (mL)
9.60mL

Observation 13C:

Table 1: Volume of