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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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einsteindude einsteindude
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9 years ago
Calculate the acid concentration of a sample of acid rain with a pH of 4.20.
A) 1.0 × 10-4 M
B) 6.3 × 10-5 M
C) 7.7 × 10-9 M
D) 4.2 × 10-1 M
E) 0.62 M
Textbook 
Conceptual Physical Science

Conceptual Physical Science


Edition: 6th
Authors:
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f_zah1f_zah1
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#2
8 years ago
how did you get the answer b
wrote...
#3
7 years ago
Quote from: jcinangel0104 (8 years ago)
how did you get the answer b

4.20 <- 2 decimal palces

[H+] = 10^-pH => [H+] = 6.3 x 10^-5 M

Decimal Places is # of significant figures
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