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O suco de repolho roxo é um indicador natural de pH porque contém antocianinas, moléculas que mudam de estrutura conforme a acidez ou basicidade da solução, alterando sua cor. Como preparar o indicador: 1. Corte algumas folhas de repolho roxo. 2. Ferva em água por 5 a 10 minutos ou bata no liquidificador com água quente. 3. Coe o líquido. O extrato roxo obtido é o indicador ácido-base. Como usar: Adicione pequenas quantidades desse extrato a diferentes líquidos (limão, vinagre, água, bicarb
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