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pH is a measure of how acidic or basic water is. Its technical and scientific definition is that it is a measure of the activity of the hydrogen ion (H + ). The pH of water is a very important measurement parameter concerning water quality. It affects aquatic life wherein some creatures can only live at a usual pH range. It can also affect the solubility and toxicity of chemicals and heavy metals in the water. pH can be measured using a potentiometric instrument such as pH meter.