In the Midwest, the natural geologic formations are typically made of limestone
ID: 917454 • Letter: I
Question
In the Midwest, the natural geologic formations are typically made of limestone (CaCO_3). The limestone in the Midwest provides the lakes and soils with a natural buffer. Pure Water What is the Ph of 1.000L of pure water? A 200.00 ml. sample of 1.000M nitric acid was added to the water sample above. What is the resulting pH? Carbonate Buffer What is the pH of a carbonate buffer solution prepared by 1.000 mol of NaHCO_3 and adding water to make a 1.000L solution 9pKa of HCO_3^- is 10.32) A 200.00 ml. sample of 1.000M nitric acid was added to the buffered solutions above. What is the resulting pH Explain conceptually the process by which the limestone can protect the lakes in the Midwest from the effects of acid rain.Explanation / Answer
1. In the case of pH or pure water, it is reported that pH or pure water, regardless of the volume it's 7.
2. The total volume would be 1000 mL + 200 mL = 1200 mL or 1.2 L.
Now, calculating the moles of the acid, and the new concentration:
[HNO3] = 1 * (200/1200) = 0.1667 M
The nitric acid is a monoprotic acid, and it's a strong acid so we can assume the disociation is complete so:
HNO3 + H2O ------> H3O+ + NO3-
pH = -log[H3O+] = -log (0.1667) = 0.78 M
3. Use the HH equation:
pH = pKa + log B/A
pH = 10.32 + log (1/1.5)
pH = 10.14
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