Page 13 - E-modul Berbasis Chemo-entrepreneurship

Dalam pembuatannya, sari buah nanas dapat ditambahkan bahan
pengawet agar dapat memperpanjang masa simpannya. Bahan
pengawet yang digunakan yaitu natrium benzoat. Natrium benzoat
sangat efektif digunakan pada makanan yang memiliki rentang pH 2,5
- 4,0 serta dapat menghambat pertumbuhan mikroorganisme.
Lalu ketika mata kita terkena air sabun akan terasa sangat perih,
namun ketika kita meneteskan obat tetes mata, mata kita tidak terasa
perih. Mengapa demikian?? Hal tersebut dikarenakan obat tetes mata
mengandung asam borat. Asam borat mampu mempertahankan pH
sehingga sesuai dengan pH air mata. Harga pH mata sama dengan
pH darah yaitu 7,4. Pada pemakaian tetesan biasa, larutan yang nyaris
tanpa rasa nyeri adalah larutan dengan pH 7,3-9,7.

(Sumber: https://dspace.uii.ac.id/)

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E-Modul Kimia untuk SMA Kelas XI