Membuat Larutan Ph = 3.docx

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Membuat larutan pH = 3 untuk pengujian asbes. Larutan dibuat dari HCl konsentrasi 3% A. Menghitung konsentrasi larutan HCl, pH = 3 pH = -log [H+] [H+] = 10^(-pH) [H+] = 0.001 mol/L B. Larutan yang digunakan adalah HCl konsentrasi 3% οƒ˜ Asumsi persen massa 3 gr 30 gr %massa = = 100 gr air 1000 gr air οƒ˜ Diketahui densitas air 1 π‘”π‘Ÿ π‘”π‘Ÿ 𝜌= = 1000 3 π‘π‘š 𝐿 οƒ˜ Maka konsentrasi menjadi π‘”π‘Ÿ πΎπ‘œπ‘›π‘ π‘’π‘›π‘‘π‘Ÿπ‘Žπ‘ π‘– π‘™π‘Žπ‘Ÿπ‘’π‘‘π‘Žπ‘› 𝐻𝐢𝐿 3% = 30 𝐿 οƒ˜ Dibagi BM HCl π‘”π‘Ÿ 30 𝐿 = 0.821918 π‘šπ‘œπ‘™ πΎπ‘œπ‘›π‘ π‘’π‘›π‘‘π‘Ÿπ‘Žπ‘ π‘– 𝐻𝐢𝑙 3% = π‘”π‘Ÿ 𝐿 36.5 π‘šπ‘œπ‘™ C. Rumus Pengenceran 𝑀1 . 𝑉1 = 𝑀2 . 𝑉2 Missal : V2 = V1 + Vair 𝑀𝐻𝐢𝑙 3% . 𝑉𝐻𝐢𝑙 3% = 𝑀𝐻𝐢𝑙.π‘Ž . (𝑉𝐻𝐢𝑙 3% + π‘‰π‘Žπ‘–π‘Ÿ) 𝑉𝐻𝐢𝑙 3% 𝑀𝐻𝐢𝑙.π‘Ž = (𝑉𝐻𝐢𝑙 3% + π‘‰π‘Žπ‘–π‘Ÿ) 𝑀𝐻𝐢𝑙 3% π‘šπ‘œπ‘™ 0.001 𝐿 𝑉𝐻𝐢𝑙 3% 1 = = = 0.00122 π‘šπ‘œπ‘™ 822 (𝑉𝐻𝐢𝑙 3% + π‘‰π‘Žπ‘–π‘Ÿ) 0.821918 𝐿 0.99878 . 𝑉𝐻𝐢𝑙 3% = 0.00122 . π‘‰π‘Žπ‘–π‘Ÿ π‘‰π‘Žπ‘–π‘Ÿ = 820.92 π‘₯ 𝑉𝐻𝐢𝑙 3% D. Permisalan Diambil 1 ml HCl 3% lalu dicampurkan dengan Vair = 820.92 ml.

B. Larutan yang digunakan adalah HCl konsentrasi 3% οƒ˜ Asumsi persen volume Menggunakan rumus :

π‘”π‘Ÿ π‘₯ 10 π‘šπ‘œπ‘™ π‘π‘š3 = 0,8343 36.5π‘”π‘Ÿ 𝐿 π‘šπ‘œπ‘™

3π‘₯1,015

C. Rumus Pengenceran 𝑀1 . 𝑉1 = 𝑀2 . 𝑉2 Missal :

V2 = V1 + Vair 𝑀𝐻𝐢𝑙 3% . 𝑉𝐻𝐢𝑙 3% = 𝑀𝐻𝐢𝑙.π‘Ž . (𝑉𝐻𝐢𝑙 3% + π‘‰π‘Žπ‘–π‘Ÿ) 𝑉𝐻𝐢𝑙 3% 𝑀𝐻𝐢𝑙.π‘Ž = (𝑉𝐻𝐢𝑙 3% + π‘‰π‘Žπ‘–π‘Ÿ) 𝑀𝐻𝐢𝑙 3% π‘šπ‘œπ‘™ 0.001 𝑉𝐻𝐢𝑙 3% 𝐿 = 1 = 0.0012 = π‘šπ‘œπ‘™ 834 (𝑉𝐻𝐢𝑙 3% + π‘‰π‘Žπ‘–π‘Ÿ) 0.8343 𝐿

𝑉𝐻𝐢𝑙 3% = 0.0012 . 𝑉𝐻𝐢𝑙 3% + 0.0012 . π‘‰π‘Žπ‘–π‘Ÿ 0.9988. 𝑉𝐻𝐢𝑙 3% = 0.0012. π‘‰π‘Žπ‘–π‘Ÿ π‘‰π‘Žπ‘–π‘Ÿ = 833.25 π‘₯ 𝑉𝐻𝐢𝑙 3% D. Permisalan Diambil 1 ml HCl 3% , lalu dicampurkan dengan Vair = 833.25 ml

Note : data densitas HCl 3% diperoleh dari : www.wolframalpha.com

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