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Calculate the pH of a 100-mL solution containing 1.00 g of imidazole (FM 68.08) and 1.00 g of imidazole hydrochloride (FM 104.54).
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- What is the effect of buffer additives (organic acids) on the enhancement factor?20.0 mL of 1:1 buffer 5.00 mL of standard NaOH pKa=4.66 [NaOH]=0.1108M pH=5.19A student titrates 29.00 mL of 0.2250 M pyridine (Kb = 1.7*10-9) with 0.3750 M HBr. Calculate the pH after the addition of 0.00 mL, 2.00 mL, 3.60 mL, 5.00 mL, 6.50 mL, 8.70 mL, 9.90 mL, 10.00 mL, 10.80 mL, 15.00 mL, 17.40 mL, 18.70 mL and 36.00 mL of HBr.
- Calculate the pH of 50mls of 0.1100M arginine to which 20 mls PH of 0.1005M Hcl have been added.Derive the titration curve when titrating 100.0mL of 0.100M weak base aniline (pka = 4.601) with 1.000M HClO4 using the following volumes of acid, 0.00mL, 2.00mL, 5.00mL, 8.00mL, 10.00mL, 13.00mL? (find the pH values and make a graph of pH vs VHClO4For a weak acid with a pKa of 6.0, show how you would calculate the ration of acid to salt at pH 5.
- What is the equivalence point pH of a 0.1M solution of phenylalanine that is fully titrated with NaOH?Construct a curve for the titration of 20.00 mL 0.500 N succinic acid (HO2CCH2CH2CO2H) by 0.1000 N NaOH solution. Use MS Excel for convenience. Titrant volumes: 0.00 mL, 5.00 mL, 10.00 mL, 15.00 mL, 20.00 mL, 25.00 mL, and 30.00 mL. (CH2)2(CO2H)2⇄(CH2)2(CO2H)(CO2)^- +H^+ Ka1= 6.21 x 10^-5; pKa1 =4.207 (CH2)2(CO2H)(CO2)^-⇄(CH2)2(CO2)2^2-+ H^+ Ka2= 2.31 x 10^-6; pKa2 =5.636Calculate how many milliliters of 0.100 M HCl should be added to how many grams of sodium acetate dihydrate (NaOAc ? 2H2O, FM 118.06) to prepare 250.0 mL of 0.100 M buffer, pH 5.00.
- What volume of 0.12 M HCl must be added to 1.5 g glycine amide to make buffer at pH 8.5? What volume of 0.08 M NaOH must be added to 1.1 g glycine amide hydrochloride to get a pH of 7.5?Suppose you want to make 250 mL 0.0700 M glycine buffer at pH 8.00. What mass of glycine amide and glycine amide HCl are needed? Hint: you need 2 eqns w/ 2 unknowns. Use the mb eqn and HH eqn. What mass of glycine amide and what volume of 0.400 M HCl are needed? What mass of glycine amide HCl and what volume of 0.600 M NaOH are needed?1 How do you use the amount of 0.01 M NaOH used in titration to determine protein content? NaOH was calibrated with KHP (0.0553 g) to get an amount of 25.2 mL 0.01 M NaOH used. GR1: 71.6 mL NaOH used GR2: 91.2 mL NaOH used GR3: 86.4 mL NaOH usedCalculate how many milliliters of 0.140 M HNO3 should be added to 200 mL containing 2.00 g K2CO3 (FM=138.206 g/mol) to give a pH of 10.15?Suppose that H2CO3 has Ka1 = 4.10–7, Ka2 = 5.10–11.