Table 7 Measured PH 4.0 4.11 4.0 12.00 4.90 HAC Ac HAC/Ac-4.0 Calculated pH 4.0 4.14 4.0 12.00 4.0 4.92 Enter a sample calculation for the experimental Ka for the 0.10 M NH4* solution and percent error. (The values you enter for your sample calculation should exactly match the corresponding values you entered above.) pH = -log[H*]; [H*] = 10-PH 4.0 (10-PH)² = (1 Ka [H+ ][A¯ ] [H+ 1² = [HA] = = 4.0✔ [HA] [HA] (0.10) 4.0 %error = lexperimental Ka value - literature K₂ value] literature Ka value x 100% = 4.0 % 10 x 100% = 4.0 4.0

Table 7 Measured PH 4.0 4.11 4.0 12.00 4.90 HAC Ac HAC/Ac-4.0 Calculated pH 4.0 4.14 4.0 12.00 4.0 4.92 Enter a sample calculation for the experimental Ka for the 0.10 M NH4* solution and percent error. (The values you enter for your sample calculation should exactly match the corresponding values you entered above.) pH = -log[H]; [H] = 10-PH 4.0 (10-PH)² = (1 Ka [H+ ][A¯ ] [H+ 1² = [HA] = = 4.0✔ [HA] [HA] (0.10) 4.0 %error = lexperimental Ka value - literature K₂ value] literature Ka value x 100% = 4.0 % 10 x 100% = 4.0 4.0

Chemistry for Engineering Students

3rd Edition

ISBN:9781285199023

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter1: Introduction To Chemistry

Section: Chapter Questions

Problem 1.77PAE

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Solution 1 Solution 2 Solution 3 Solution 4 Solution 5 Concentration iron(III) nitrate 0.00200 0.00200 0.00200 0.00200 0.00200 [Fe(NO3)3] (M) Concentration potassium thiocyanate 0.00200 0.00200 0.00200 0.00200 0.00200 [KSCN] (M) Volume Fe(NO3)3 (mL) 5.00 5.00 5.00 5.00 5.00 Volume KSCN (mL) 5.00 4.00 3.00 2.00 1.00 Volume DI water (mL) 0.00 1.00 2.00 3.00 4.00 Initial concentration [Fe3+] (M) 0.00100 0.00100 0.00100 0.00100 0.00100 Initial concentration [SCN‍] (M) 0.00100 0.000800 0.000600 0.000400 0.000200 Absorbance 0.269 0.192 0.154 0.104 0.052 Equilibrium [FeSCN2+] (M) 0.000198 0.000141 0.000113 0.0000765 0.000038 Equilibrium constant Kc Average Kc
6. _(6a)_ 2CUSO4. + 4NaOH » CH:COOH ±_(6b)__ + 2NA2SO4 + HzO
Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample. The stated should be 104.5, how??
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Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample.
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