When an acid is dissolved in water, by releasing protons into the solution, it lowers the pH.
What is pH?
The letters pH stand for the potential of hydrogen since pH is essentially a measurement of the number of hydrogen ions (i.e. protons) in a substance. The pH scale was created in 1923 by scientist Peter Lauritz Srensen. (1868-1969).
The pH of a solution is a key marker of its chemical makeup. The pH can have an impact on the biological processes that take place, the behavior of bacteria, and the behavior of chemicals.
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Convert the given density in mg/dL into a quantity with unit of g/L. This is shown below,
(200 mg / dL) x (10 dL / L) x (1 g / 1000 mg) = 2 g/L
Multiplying this quantity with the volume given, 5L, gives an answer of 10g.
B. Mg(OH)2 precipitate will be formed<span />
Answer:
The highest molality will be for the NH₄NO₃ . Option 5.
Explanation:
In order to determine which of the salts has the highest molality we must know the moles of each
10 g / 149.89 g/mol = 0.0667 moles NaI
10 g / 166 g/mol = 0.0602 moles KI
10 g / 147.4 g/mol = 0.0678 moles of RbNO₃
10 g / 80 g/ mol = 0.125 moles of NH₄NO₃
To determine molality we convert the mass of solvent (water) from g to kg
800 g . 1kg / 1000 g = 0.8 kg
Molality means the moles of solute in 1kg of solvent
0.0667 moles NaI / 0.8 kg of water = 0.083 m
0.0602 moles KI / 0.8 kg of water = 0.0752 m
0.0678 moles of RbNO₃ / 0.8 kg of water = 0.0847 m
0.125 moles of NH₄NO₃ / 0.8 kg of water = 0.156 m
