10: Differences in acidity: Here are two problems

Remember how we compared wave amplitudes released by two earthquakes? You can do the same thing with acidity:

The pH of lemon juice is 4.2. The pH of milk is 7.8. By what factor does the hydrogen ion concentration change between the two liquids?


  Finally, can you figure out how to use the antilog to calculate the concentration?

The pH of lemon juice is 4.2. How many moles of H+ are present in 5 litres of lemon juice?