The water acidity in a pool is considered normal


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water acidity in a pool is considered normal when the average pH reading of 3 daily measurement is between 7.2 and 7.8 . If the first to two pH 7.48 and 7.85 find the range of PH value for the third reading that will result in the acidity level normal???

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The range of pH of the third day is from 6.27 to 8.07

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