We are told we have a 14% w/v solution, where w/v is weight/volume. We are asked to prepare 1 L of a 1:4000 solution which can also be written as (1/4000) x 100% = 0.025% w/v solution.
The formula needed here is C1V1 = C2V2 where C1 is the initial concentration, V1 is the initial volume, C2 is the new concentration, and V2 is the new volume.
C1 = 14%
C2 = 0.025 %
V2 = 1 L = 1000 mL
V1 = ?
We must solve for the initial volume V1, which will tell us how much of the initial solution to use.
(14)(V1) = (0.025)(1000 mL)
V1 = 25/14
V1 = 1.8 mL
We will require 1.8 mL of the initial 14% w/v topical antiseptic solution to prepare 1L of a 0.025% w/v solution.
Answer:
Loose Material is compacted by pressure.
Answer: Chlorine I think
Explanation:
Chlorine is added to the water to kill germs. When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E.
Answer:
I think option A is right answer
Answer:
(1) 0.10 (2) 17.8 g
Explanation:
Since the reaction ratio is 1:1 what we need is to convert the given masses to moles and you will have the answer:
MW anthracene = 178.23 g/mol
MW maleic anhydride = 98.06 g/mol
a) mass anthracene = 178 mg x 1 g/ 1000 mg = 0.178 g anthracene
Moles anthracene = 0.178 g anthracene/ 178.23 g/mol
= 0.001 mol anthracene
0.001 mol anthracene x 1 mol maleic acid/mol anthracene
= 0.001 mol maleic anhydride
mass maleic anhydride = 0.001 mol x 98.06 g/mol = 0.10 g
b) moles maleic anhydride = 9.8 g/ 98.06 g/mol = 0.099 moles
0.099 moles maleic anhydride x 1 mol anthracene/mol maleic anhydride =
0.099 mol anthracene
g anthracene = 0.10mol x 178 g/mol = 17.8 g