Chemistry, 07.03.2020 04:37, barisege6030
A student pipetted five 25.00 milliliter samples of hydrochloric acid and transferred each sample to an Erlenmeyer flask, diluted it with distilled water, and added a few drops of phenolphthalein to each. Each sample was then titrated with a sodium hydroxide solution to the appearance of the first permanent faint pink color. The following results were obtained.
Volumes of NaOH Solution
First Sample35.22 mL
Second Sample36.14 mL
Third Sample36.13 mL
Fourth Sample36.15 mL
Fifth Sample36.12 mL
Which of the following is the most probable explanation for the variation in the student's results?
A) The burette was not rinsed with NaOH solution.
B) The student misread a 5 for a 6 on the burette when the first sample was titrated.
C) A different amount of water was added to the first sample.
D) The pipette was not rinsed with the HCI solution. If the pipet were initialed rinsed with water and then not
rinsed again with the HCl solution, in the first trial the HCl was diluted by the water and thus less NaOH was
required to titrate
E) The student added too little indicator to the first sample.
Answers: 2
Chemistry, 23.06.2019 10:20, Thejollyhellhound20
Based on the equation, how many grams of br2 are required to react completely with 29.2 grams of alcl3? alcl3 + br2 → albr3 + cl2 48.7 grams 52.6 grams 56.7 grams 61.3 grams
Answers: 3
Chemistry, 23.06.2019 16:30, brookeleneewick
All chemical reactions use reactants in a specific proportion or stoichiometry to form products. the reactant regulates the amount of products produced. a) excess b) limiting c) proportional d) stoichiometric
Answers: 1
A student pipetted five 25.00 milliliter samples of hydrochloric acid and transferred each sample to...
Mathematics, 05.05.2021 23:10
Mathematics, 05.05.2021 23:10