WAEC Chemistry 2020 Objective — Question 29
Question 29 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
Advertisement
If 5.0 cm^3 of 0.200 mol dm^-3 Na2CO3 was diluted to 250 cm^3 solution, what would be the concentration of the resulting solution?
- A. 0.004 mol dm^-3Correct
- B. 0.020 mol dm^-3
- C. 0.200 mol dm^-3
- D. 0.400 mol dm^-3
Explanation
Using the dilution law: C1V1=C2V2. C1=0.2M, V1=5.0cm^3, V2=250cm^3. C2=(0.2x5)/250=0.004 M.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.