If the solution is brilliant re in alkalies and decolorized
by acids it’s the time to used phenolphthalein in analysis as an indicator. The
resulting solution is acidic, so you need an indicator that has a pH range that
includes pH values below 7.0, like methyl orange, methyl yellow If titrating a
strong acid and a weak base and it’s time to use as an indicator called bromophenol
blue .
Answer:
B
Explanation:
Hellium is a gas...
Solids are particles that are packed together
liquids are particles that are together but conforme to their container
gas have space between them and conform to their holder
<span>3.75 gallons need to be drained and replaced with bleach.
Change the problem to "What amounts of a 100% solution and a 4% solution is needed to make 90 gallons of a 8% solution?" Given that, we'll use the following values.
x = amount of 4% solution.
90-x = amount of a 100% solution.
The equation to solve then becomes.
0.04 x + (90-x) = 0.08 * 90
0.04 x + 90 - x = 7.2
Add x to both sides
0.04x + 90 = 7.2 + x
Subtract 0.04x from both sides
90 = 7.2 + 0.96x
Subtract 7.2 from both sides
82.8 = 0.96x
Divide both sides by 0.96
86.25 = x
So you now know that you need 86.25 gallons of the original 4% solution and (90-86.25) = 3.75 gallons of the bleach to make the desired 90 gallons.
So simply drain 3.75 gallons from the tank and replace with bleach.</span>
I think that its a but I'm not sure, sorry if it's wrong