kertas lakmus

Kertas Lakmus

Kertas Lakmus

Kertas LakmusSemua asam dan basa mempunyai sifat sifat tertentu, tidak semua asam mempunyai sifat yang sama demikian juga pada basa. Kita juga sudah mengenal bahwa asam terbagi menjadi dua yaitu asam lemah dan asam kuat, demikian juga basa, ada basa kuat dan basa lemah. Kekuatan asam atau basa tergantung dari bagaimana suatu senyawa diuraikan dalam pembentukan ion-ion jika senyawa tersebut dalam air. Asam atau basa juga bersifat elektrolit, daya hantar larutan elektrolit bergantung pada konsentrasi ion-ion dalam larutan.

Elektrolit kuat jika dapat terionisasi secara sempurna sehingga konsentrasi ion relatif besar, elektrolit lemah jika hanya sebagian kecil saja yang dapat terionisasi, sehingga konsentrasi ion relatif sedikit. Untuk mengetahui suatu larutan termasuk elektrolit atau bukan dapat menggunakan alat penguji elektrolit atau juga dapat menggunakan alat pH meter, dan indikator universal untuk mengetahui pH suatu larutan secara langsung sehingga dapat diketahui apakah larutan tersebut termasuk asam, basa atau garam.

Nilai pH ditunjukkan dengan skala, secara sistematis dengan nomor 0-14. ”Kertas Lakmus adalah suatu kertas dari bahan kimia yang akan berubah warna jika dicelupkan kedalam larutan asam/basa. Warna yang dihasilkan sangat dipengaruhi oleh kadar pH dalam larutan yang ada. Warna kertas lakmus dalam larytan asam, larytan basa, dan larutan bersifat netral berbeda.

Ada dua macam kertas lakmus, yaitu lakmus merah dan lakmus biru. Sifat dari masing-masing kertas lakmus tersebut sbagai berikut. a. Lakmus merah dalam larutan asam berwarna merah dan dalam larutan basa berwarna biru dan dalam larutan netral berwarna merah. b. Lakmus biru dalam larutan asam berwarna merah dan dalam larutan basa berwarna biru dan dalam larutan netral berwarna biru. c. Metil merah dalam larutan asam berwarna merah dan dalam larutan basa berwarna kuning dan dalam larutan netral berwarna kuning. d. Metil Jingga dalam larutan asam berwarna merah dan dalam larutan basa berwarna kuning dan dalam larutan netral berwarna kuning. e. Fenolftalin dalam larutan asam berwarna – dan dalam larutan basa berwarna merah dan dalam larutan netral berwarna – .

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