Take the log of the number that you got in Step 3. Log is short for logarithm, which is a math function just like addition or subtraction. However, you will almost always need a calculator to find logs. In this example, you would use a calculator to take the log of 2 and get 0.30. Add the number that you got in Step 4 to the pH given to you in the problem. If your solution has a given pH of 1.3, add 0.3 to 1.3 to get a pKa of 1.6. Step 6. Check your work. The most important formula to remember is that the pKa = pH + log(Acid/Base), better known as the Henderson-Hasselbalch equation.
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A team is studying the cause of the accident, the company said. Vale is reliant on the port and connecting railway, together known as the Nacala Corridor, to reach capacity at its Moatize coal mine in northwest Mozambique.he rail line runs for 900 km (560 miles) through land-locked Malawi to the port of Nacala on the Indian Ocean. Vale had originally said it expected to ship coal from the new port in the first quarter of 2015.