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Diketahui:
Larutan asam merubah warna kertas lakmus merah menjadi biru, dan warnah merah tetap merah.
Larutan garam tidak merubah warna kertas lakmus
Jadi, jawaban yang tepat adalah B
Larutan yang bersifat asam akan menyebabkan kertas lakmus biru berubah warna menjadi merah dan kertas lakmus merah tetap berwarna merah, maka larutan yang bersifat asam adalah larutan 1 dan 2.
Larutan yang bersifat basa akan menyebabkan kertas lakmus merah berubah warna menjadi biru dan kertas lakmus biru tetap berwarna biru, maka jenis larutan yang bersifat basa adalah larutan 4. Jadi jawaban yang benar adalah C.