
UAS KIMIA
Authored by Isnanda Nuriskasari
Chemistry
University
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Larutan dengan pH=12+log 2 dibuat dengan melarutkan a gram NaOH (Mr=40) ke dalam air hingga volum larutan 500ml. besarnya a adalah….
4,0
2,0
1,0
0,4
0,2
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Pada reaksi asam basa berikut:
(1) HCO3-+ H2O → H2CO3 + OH-
(2) HS- + H2O → H3O+ + S2-
(3) HPO42- + H3O+ → H2PO4- + H2O
H2O bertindak sebagai basa menurut teori asam basa Bronsted-Lowry terdapat pada reaksi ….
1, 2, dan 3
1, 2
1, 3
2, 3
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Besarnya pH larutan 0,74 gram Ca(OH)2 (Ar Ca = 40, O = 16, dan H = 1) dalam
500 mL larutan adalah … .
2 – log 4
2 + log 4
11 + log 4
12 – log 4
12 + log 4
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Jika larutan asam asetat mempunyai pH = 3 dan Ka = 10–5 (Mr = 60), maka
jumlah asam asetat dalam 1 liter larutan asam asetat sebesar … .
0,6 gram
0,3 gram
3 gram
60 gram
6 gram
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Senyawa HClO4 dapat bersifat asam maupun basa. Reaksi yang menunjukkan bahwa HClO4 basa adalah ….
HClO4 + NH2– ↔ ClO4– + NH3
HClO4 + NH3 ↔ ClO4– + NH4+
HClO4 + H2O ↔ ClO4– + H3O+
HClO4 + OH– ↔ ClO4– + H2O
HClO4 + N2H5+ ↔ H2ClO4– + N2H4
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Dari hasil pengujian air limbah suatu industri makanan, diperoleh data bahwa air limbah menjadi berwarna merah setelah ditetesi indikator metil jingga, berwarna kuning setelah ditetesi BKH dan berwarna kuning setelah ditetesi BTB. Dapat disimpulkan bahwa pH air limbah tersebut adalah…
pH ≥ 7,6
pH ≤ 6,0
pH ≤ 3,1
5,4 ≤ pH ≤ 7,6
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Diketahui trayek perubahan warna beberapa indikator terlampir.
Sampel larutan X bila diuji dengan :
*Indikator MO dan MR berwarna kuning,
*Indikator BTB berwarna biru, dan
*Indikator PP tidak berwarna
Maka harga pH larutan X tersebut adalah :
Di antara 4,4 dan 6,2
Di atas 6,2
Di antara 6,0 dan 7,6
Di atas 7,6
Di antara 7,6 dan 8,3
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