Chemistry, 16.11.2019 04:31 xonyemaa12
When 38.0 ml of 0.1250 m h2so4 is added to 100. ml of a solution of pb(no3)2, a precipitate of pbso4 forms. the pbso4 is then filtered from the solution, dried, and weighed. if the recovered pbso4 is found to have a mass of 0.0471 g, what was the concentration of nitrate ions in the original solution, assuming that all of pb2+ has been precipitated?
a) 1.55 × 10–3 m
b) 3.11 × 10–3 m
c) 1.55 × 10–4 m
d) 6.20 × 10–3 m
e) 3.10 × 10–4 m
Answers: 1
Chemistry, 22.06.2019 04:30
Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.
Answers: 1
Chemistry, 22.06.2019 18:00
Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]
Answers: 1
When 38.0 ml of 0.1250 m h2so4 is added to 100. ml of a solution of pb(no3)2, a precipitate of pbso4...
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