Answer:
4.48 - 6.48
Explanation:
A pH indicator works in a better way in a range of pH = pKa ± 1. That means we need to determine the pKa of the indicator propyl red to find the range over which it change its color. That is:
pKa = -log Ka
pKa = -log 3.3x10⁻⁶
pKa = 5.48
That means the range over propyl red will change from yellow to red or vice versa is:
4.48 - 6.48
A mole contains Avogadro’s number of particles of a substance.
Answer:
300 g
Explanation:
To solve this convert atoms to moles to grams. To convert atoms to moles, you will need Avogadro's number (6.022*10²³ atoms/mol), and to convert moles to grams, you will need the atomic mass of Cl (34.45 g/mol).
Divide the given mass of Cl by Avogadro's number to find moles. Get 8.718..
Multiply the moles by the atomic mass. Get 300.3..
Your answer is 300 g because of significant figures.
Answer:
Bubbles will be formed when two solutions will be combined.
Explanation:
When the solution containing 
and 
as a solute will be combined, the reaction will be as follows,
As a result of combination of the two solutions bubbles will be formed which will depict the evolution of carbon dioxide gas.
