Whion is a correct step in a scientific experiment involving acids and bases? Mixing two acids to form a neutral solution.
Using an indicator to measure the hydrogen ion concentration of a solution.
Pouring acid onto an indicator to measure the pH of the indicator.
Dissolving an indicator in an acidic solution to increase its pH.

the answer is b & c i believe : )

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.