Which of the following is the best instrument to use to prepare a solution?

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?