What is the standard deviation Compare the average standardized concentration wi

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What is the standard deviation
Compare the average standardized concentration with concentration of HNO3 reported in task 3 Norma 1 No spac... Heading 1 Heading 2 Font Paragraph In this lab experiment we will determine the concentration ofnitric acid using sodium carbonate solution as a primary standard in volumetric analysis (acid-base titration) Data/Results: Task 1 aration of standard solutions Prepare 0.5 MNa2CO3 105.99 g 0.5 mol Na2co3 x250 mL solo 13.25 g Na2CO3 1 mol 1000 mL sol Task 2 Dilution of the standard solutions to lower concentration a) 13.249 g x 4 52.996 105.99 g Na2CO3 4999 L b) V1 4.99 mL, e) C2 .4993 MHNO3 Task 3 Measurement of pH and conductivity of the solutions Electrical conductivity DI Watte 61 44 104123 Tap Water 8.00 0.5 M Na2CO3 29 205 133 0.01 M NaCO3 2158 11.07 30 307 32 0.5 M HNO3 4 312 2.06 0.01 M HNO3 dization of ochloric acid solution Burette Rea Initial Final Volume Trial 247K 0 452 Trial 2 45,2 Discussion: What is the average standardized concentration of the HNO3?

Explanation / Answer

Molarity of HNO3

Na2CO3 + 2HNO3 ---> H2CO3 + 2NaNO3

Trial 1 :

Buret reading = 47.7 ml

moles of Na2CO3 used = 0.5 M x 47.7 ml

= 23.85 mmol

moles of HNO3 present = 2 x 23.85

= 47.7 mmol

molar concentration of HNO3 = 47.7 mmol/volume of HNO3 solution taken

By feeding the volume of HNO3 value, we can get the exact concentration of HNO3 by trial 1.

Similar calculation can be done for trial 2

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