I need help asap! With 3 and 4 giving brainliest

Brainliesttt asap!me : ) who can read an article and answer some questions about it? ? only answer if you can.. : )

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

What is the empirical formula for c4h8o2