Standardizing a Solution of Potassium Hydroxide Sample

Abstraction: In this lab. a prepared solution of Potassium Hydroxide will be standardized. The solution we will be standardized by executing multiple computations to guarantee the topmost truth. The acid used for this titration will be KHP ( C4H5KO4 ) . Phenolphthalein we be added to the beaker of the dissolved acid before the titration will be added. The titration will halt when the solution turns pink and the colour doesn’t travel off. Procedure: The process is stated in my notebook

Data/Observations:Observations of all trials|* The solid KHP dissolved in distilled H2O * The Solution turned stayed pink after adequate KOH was added to the dissolved KHP.

|

Trial 1: 1. 5316g KHP50. 000 mL KOH in burette28. 000 mL KOH in beaker

Trial 2: 1. 5408g KHP50. 000mL KOH in burette31. 500mL KOH in beaker

Trial 3: 1. 5380g KHP50. 000mL KOH in burette31. 500mL KOH in beakerAnalysis:0. 025L ? . 300M1L= . 0075mol KOHKHP ( C8H5KO4 ) molar mass: ( 12. 0101 ?8 ) + ( 1. 00794?5 ) + ( 39. 0983 ) + ( 15. 9994?4 ) = 204. 2156g. 0075mol KOH ?1mol KHP1mol KOH ?204. 2156g KHP1mol KHP=1.

5316g KHP for solid 1. 5316g?1mole204. 2156g=7. 500?10-3moles

7. 500?10-3moles. 02800L=0. 26787M1. 5408g?1mole204. 2156g=7. 545?10-3moles7. 545?10-3moles. 03150L=0. 23954M1. 538g?1mole204. 2156g=7. 532?10-3 7. 532?10-3. 03150L=0. 23910M. 26787+ . 23954+ . 23910 = . 74651. 746513=0. 24884M KOH

Trial 1: 0. 26787 MeterTrial 2: 0. 23954 MeterTrial 3: 0. 23910 MeterAccepted value: 0. 24884 MeterPercent output: . 24884. 2583?100 % =96. 33 %

Percentage mistake: . 24884- . 2583. 2583?100 % =3. 662 % Decision: In this experiment. a solution of KOH was standardized with titration. The KOH reacted with KHP which was dissolved in distilled H2O before titration. Phenolphthalein was added to the KHP solution as in index of the nature of the solution ( acidic or basic ) . After all three tests the recognized value of the molar concentration of KOH was. 24884 M. The per centum mistake was 3. 662 % where the category accepted value was used as the theoretical value and the group value was used as the existent. The measuring of millilitres limited the sum of sig figs since the burette could merely mensurate to the 1000s topographic point. Preciseness could hold been improved by utilizing a burette with more graduations on it. If overtitration had occurred. the molar concentration of the KOH in the solution since more molecules of KOH would be added to the solution and therefore impacting the molar concentration.