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pH 0pHは酸性、アルカリ性を示す値です。pH (ピーエッチ) 望ましいpH値の範囲 アルカリ性 7 5 11 3 13 9 8 4 6 10 12 14 2 1 酸性 pH pH 中性 水酸化ナトリウム
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