Answer:
8.5%
Step-by-step explanation:
The unknown final concentration can be found out by the dilution formula C1V1 = C2V2
where,
C1 = Starting concentration = 100%
V1 = Starting volume = 200μL
C2 = Final concentration
V2 = Final volume = 2350μL ( 2000 + 150 + 200 )
So,
100 * 200 = C2 * 2350
C2 = (100 * 200) / 2350
= 20000 / 2350
= 8.5%