Question: thank you (grade12math) PH = - log [H+] 1. The pH of black coffee is 5.1. What is the pH of a substance that is

thank you (grade12math)

PH = - log [H+] 1. The pH of black coffee is 5.1. What is the pH of a substance that is 40 times less acidic than black coffee? Round your answer to 2 decimal places. (Hint: One of the equations to the right is a good starting point) [3] B2 - B1 = 10 108 7 M = 108 10 2. OBronium-12 is a radioactive material that spontaneously decays when it comes in contact with oxygen. One minute after a 200-mg sample of OBronium-12 is placed into an oxygen chamber, only 140 mg remains. Round your answers to 1 decimal place. a ) Determine the half-life of OBronium-12 in seconds. [4] b ) After how long would there be 20% of OBronium-12 left in seconds? [3]

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