Di laboratorium tersedia larutan HCl 5 M sebanyak 200 mL. Seorang siswa membutuhkan larutan HCl 1 M sebanyak 250 mL, maka larutan HCl 5 M yang harus diambil siswa tersebut untuk membuat larutan yang ia butuhkan adalah …

Di laboratorium tersedia larutan HCl 5 M sebanyak 200 mL. Seorang siswa membutuhkan larutan HCl 1 M sebanyak 250 mL, maka larutan HCl 5 M yang harus diambil siswa tersebut untuk membuat larutan yang ia butuhkan adalah …
A. 25 mL
B. 50 mL
C. 75 mL
D. 150 mL
E. 200 mL

Jawaban yang benar adalah B.

Pengenceran merupakan proses menurunkan konsentrasi suatu larutan dengan cara menambahkan pelarut (biasanya air) ke dalam larutan tersebut. Adapun persamaan yang digunakan dalam proses pengenceran adalah sebagai berikut.

M1 V1 = M2 V2

keterangan:
M1 = konsetrasi larutan mula-mula
V1 = volume larutan mula-mula
M2 = konsetrasi larutan setelah pengenceran
V2 = volume larutan setelah pengenceran

Guna mengetahui volume larutan HCl yang harus diambil siswa tersebut, maka dilakukan perhitungan berikut.

5 M x V1 = 1 M x 250 ml
V1 = 50 ml

Dengan demikian, volume larutan HCl 5 Mcyang harus diambil siswa tersebut adalah 50 ml.

Baca Juga :  Complete the sentences with a form of the verb in parentheses. Three hundred and fifty years ago, people (1. make) /made/ their own clothes. They (2. have, not) _____ machines for making clothes. There (3. be, not) _____ any clothing factories. People (4. tear) _____ homemade clothes that were sewn by hand. Today, very few people (5. make) _____ their own clothes. Clothing (6. come) _____ ready-made from factories. People (7. buy) _____ almost all their clothes from stores. The modern clothing industry (8. be) _____ international. As a result, people from different countries often (9. wear) _____ similar clothes. For example, people in many different countries throughout the world (10. wear) _____ jeans and t-shirts. However, some regional differences in clothing still (11. exist) _____ for instance, people of the Arabian deserts (12. wear) _____ loose, flowing lobes to protect themselves from the heat of the sun. In parts of Northern Europe, fur hats (13. be) _____ common in the winter. In the future, there (14. be, probably) _____ fewer and fewer differences in clothing. People throughout the world (15. wear) _____ clothes from the same factories. (16. We all, dress) _____ in the future? TV shows and movies about the future often (17. show) _____ everybody in a uniform of some kind. What (18. you, think) _____? Number 8