The pH scale is a measure of how ____ or ____ a solution is. The ____ the pH of a solution, the more acidic it is. The ____ the pH of the solution, the ____ alkaline it is. An____ changes its colour depending on the pH of the solution. To measure the pH we could also use a ____ attached to a pH meter to measure it ____. An acid plus a base react together to produce ____ and ____. This reaction is called ____. In this type of reaction the acid produces ____ ions and the base produces ____ ions. The ____ are ____ and they have a pH of ____.

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