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Abstrak: Optimum Dose of Hydrated Lime for pH Neutralizing  in Coal Mine Waste-water. Coal mines release chemicals such as pyrite (Fe 2 S), produce acid waste water (H 2 SO 4 ). This research aims to know the optimum dose of hydrated lime to neutralize the pH of coal mining wastewater. This research was experimental study with pretest-postest with control group design, measured pH before and after treatment. Coal mines wastewater was sampled with composite sampling method. The result showed that the average of waste-water’s pH before added 2% hydrated lime were 4,9, while wastewater added by variated dose of hydrated lime, the pH changed. Added 1, 3, 5, 7 and 9 ml hydrated lime, the pH particularly to be 5,3, 7,1, 8,2, 9,7 and 10,5. Statistical test using One Way Anova showed the p value = 0,000, ore less than α = 0,05. There was the difference significantly between pH’s average of coal mine wastewater at variation in dose of 2% hydrated lime. Test of Linier regression found equation; y = 4,906 + 0,649x with correlation value (R) = 0,982. Optimum dose of 2% hydrated lime for pH neutralizing 1 litre of coal mine wastewater was 3,23, pH=7. Keyword :  Air limbah batubara; larutan kapur; pH

Dosis Optimum Larutan Kapur untuk Netralisasi pH Air Limbah Penambangan Batubara