Normal rain has a pH between 5.0 and 5.5. The typical pH value for acid rain (when checked online) is 4.0.
There are 1000 mg in 1 gram.
3.76/1000 = 0.00376
10^-3 = 0.001
0.001 x 3.76 = 0.00376
Answer is
3.76 x 10^-3
The Lewis bases are those which can donate electron pair to an acceptor. These electrons can be a pair of electron that is a lone pair, a negative charge or electrons in a 
-bond.
- In
, the presence of -bond make it a Lewis base. - In
, the presence of negative charge makes it a Lewis base. - In
, the presence of lone pair on nitrogen makes it a Lewis base. - In
, there is no lone pair, no -bond, no negative charge so it is not a Lewis base.
Hence, , , and are Lewis bases.
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