Question

How to know that the ph of a substanse is acidic basic and neutral only by looking at its chemical formula?

Answer 1

To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrogen ions).

Answer 2

Although it isn't a perfectly reliable way of identifying a solution, in some cases a solution's molecular formula can help you identify whether it is acidic or basic. Use this method if you have no other way to definitively identify a solution. If the solution's formula begins with H, such as HCl or H2SO4, it is usually acidic. If the solution ends in -OH, such as NaOH or KOH, it is often basic.