excess base is added to the acid. The mixture can then be filtered to remove unreacted metal carbonate or metal oxide. The filtrate can then be evaporated to leave the salt produced. Watch this ...

Several different bases can neutralise acids. A salt and water are always produced as a result of these reactions. Metal oxides and alkalis are two types of base. Basic substances neutralise acids ...

If you really need a substitution, the general rule is that you need three times the baking powder for the equivalent ...