Which solution, solution X of pH 9.4 or solution Y of pH 7.5, is more acidic? Which solution, solution of 9.4 or solution of 7.5
1 answer:
Answer:
Solution Y is more acidic
Explanation:
The pH value is an indicator of the concentration of hydrogen ions (H⁺) in an aqueous solution, and it is defined as:
pH= -log [H⁺]
⇒
Where [H⁺] is the concentration of H⁺. A solution with a higher concentration of H⁺ is more acidic, and a solution with a lower concentration of H⁺ is less acidic or basic.
As result, <em>the lower the pH, the more the concentration of hydrogen ions ([H⁺]), and the aqueous solution is more acidic</em>.
Solution Y has a lower pH value (7.5) than solution X (9.4). So, solution Y is more acidic.
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Answer: 0.19M
Explanation:
Using Molarity equation:
= molarity of acid
= volume of acid
= molarity of base
= volume of base
Thus the concentration of the solution is 0.19M.
Explanation:
(a) When we move across a period then there occurs a decrease in atomic size of the elements due to increase in force of attraction between the protons and electrons of an atom.
On the other hand, when we move down a group then there will occur an increase in atomic size of the elements due to increase in number of electrons which will also increase number of shells.
For example, Mg and Ca are group 2 elements, Br is a group 17 element and Ar is a group 18 element.
Hence, these are arranged in order of increasing radius as Ar < Br < Mg < Ca.
(b) Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.
When we move across a period from left to right then there occurs a decrease in atomic size of the atoms. Therefore, ionization energy increases along a period but decreases along a group.
Hence, order of increasing ionization energy for the given species is as follows.
Na < O < = Ne
(c) Electronegativity is defined as the ability of an atom to attract electrons towards itself. When we move across a period then there occurs an increase in electronegativity of the atoms.
And, when we move down a group then there occurs a decrease in electronegativity of the atoms.
Therefore, for the given elements order of increasing electronegativity is as follows.
Al < H < O F