When Ca(OH)₂ is added to a beaker of water the solution would turn phenolphthalein pink. Phenolphthalein is a common indicator and is only pink when in basic solutions. By adding calcium hydroxide, you are turning the solution into a basic solution since the concentration of OH⁻ ions is going up and therefore any phenolphthalein in solution would turn pink.
(answers A,C, and D would happen if you added an acid to the water such as HCl)
I hope this helps. Let me know if anything is unclear.
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Answer:
This should help you with your problem
The unit ppm (parts per million) should be numerically equal to the unit of mg/L (milligram per liter). First, we determine the volume of the stock solution in L.
V = (100 mL)(1 L/1000 mL)
V = 0.1 L
Then, the equation that would allow us to determine the value of mass is,
C = m/V
where C is concentration, m is mass, and V is the volume.
Substituting the known values,
2 = m/ 0.1
The value of m from the equation is 0.2.
Answer: 0.2 mg
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