Purpose (0.5 pt): ha oin the nouede o nouso Standardi2 and Theoretical Backgroun
ID: 589808 • Letter: P
Question
Purpose (0.5 pt): ha oin the nouede o nouso Standardi2 and Theoretical Background (3 pts): Write in complete sentences. Your background should include a balanced chemical e titration and describe the use of indicator and en quat for a general acid/base d point in a titration experiment. Data: Data Table I: Standardization of a NaOH Solution (0.5 pt) Titration #1 #2 #3 Mass of KHP (g) Final Buret Reading (mL) | Initial Buret Reading (mL) | Volume Used (mL) ·We 34·34 3.88 | | | O . I 3G. 7 9 36.66 o. 135 . 8 | 3s .66Explanation / Answer
Part A) Standardization of NaOH
molar mass of KHP = 204.22 g/mol
moles KHP = moles NaOH = grams KHP/molar mass
molarity NaOH = moles NaOH/volume NaOH
Trial mass KHP (g) moles KHP (mol) Volume NaOH (ml) molarity NaOH (M)
#1 0.704 0.00345 33.88 0.102
#2 0.765 0.00374 36.66 0.102
#3 0.745 0.00365 35.66 0.102
average molarity of NaOH = 0.102 M
Relative Standard Deviation = 0
Part B) Calculated results for unknown acid
moles = molarity x volume
molar mass = grams/moles
Trial mass unknown acid (g) Volume NaOH (ml) moles NaOH (mol) molar mass (g/mol)
#1 0.225 29.23 0.003 75
#2 0.240 29.78 0.00304 79
#3 0.224 29.11 0.00297 75.4
average molar mass = 76.5 g/mol
RSD = sq.rt.[(x - mean)^2/2] = sq.rt.[(2.25 + 6.25 + 1.21)/2] = 2.20
x = individual trial molar masses
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