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nov
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2016
Assunto sobre PH e POH assunto do 2º ano do ensino médio
1)Uma solução de 150 ml de HF, em água, tem PH igual a 2,1. Qual o volume de água necessário que se deve adicionar a essa solução para que seu PH fique igual a 2,5? 2)foram adicionados 400 ml...
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