1) In the standardization of a sodium hydroxide (NaOH) solution, 1.0211g of potassium biphthalate C6H4COOHCOOK (MM = 204.22 g mol-1) was analytically weighed and transferred to a 250 ml Erlenmeyer flask. In the titration, 25.00mL of NaOH were used. a) What is the concentration (mol / L) of NaOH? b1:0.0 mL; b2:5.00 mL; b3:10.00 mL; b4:11.00 mL; b) 20.00 ml of a 0.1000mol/L hydrochloric acid solution (HCl) were titrated with the NaOH solution standardized above. For this titration, calculate the pH of the solution when the volume of NaOH added is equal to:
1) In the standardization of a sodium hydroxide (NaOH) solution, 1.0211g of potassium biphthalate C6H4COOHCOOK (MM = 204.22 g mol-1) was analytically weighed and transferred to a 250 ml Erlenmeyer flask. In the titration, 25.00mL of NaOH were used.
a) What is the concentration (mol / L) of NaOH?
b1:0.0 mL;
b2:5.00 mL;
b3:10.00 mL;
b4:11.00 mL;
b) 20.00 ml of a 0.1000mol/L hydrochloric acid solution (HCl) were titrated with the NaOH solution standardized above. For this titration, calculate the pH of the solution when the volume of NaOH added is equal to:
c)Using the values obtained in b, sketch the titration curve (pH vs. NaOH volume).
d) Knowing that the pH range for turning the color of the cresol red indicator is between 7.2 to 8.8 explains whether or not it can be useful for the titration of HCl with NaOH.
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