Devon’s laboratory is out of material to make phosphate buffer. he is considering using sulfate to make a buffer instead. the pka values for the two hydrogens in h2so4 are -10 and 2.
will this approach work for making a buffer effective near a ph of 7?
o yes
o not enough information to answer
o no
what is the optimal ph for sulfate‑based buffers? enter your answer as a whole number.
Answers: 1
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
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Answers: 1
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