Chemistry, 13.10.2020 01:01 kprincess16r
how would it affect your results if you use a wet Erlenmeyer flask instead of a dry one when transferring your acid solution from a volumetric pipette? pls someone answer pls
Answers: 2
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
how would it affect your results if you use a wet Erlenmeyer flask instead of a dry one when transfe...
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