Answer: M = 2.08 M
Explanation: Molarity is expressed as the number of moles per unit volume in liters. First convert the mass of HCl to moles using its molar mass. Then substitute the variables to the formula for molarity.
75.00 g HCl x 1 mole HCl / 36 g HCl
= 2.08 moles HCl
For Molarity.
M = n / L
= 2.08 moles HCl / 1.000 L
= 2.08 M
Answer: Option (B) is the correct answer.
Explanation:
An aqueous solution that consists of a mixture of weak base and its conjugate acid or a weak acid and its conjugate base is known as a buffer.
When we add a strong acid or base into this mixture then the change in pH of this mixture is very small.
In a buffer solution, pH depends on the ratio of concentration of base divided by concentration of acid.
It is known that for a given temperature, the value of remains constant.
Therefore, relation between pH and will be as follows.
pH =
Thus, we can conclude that the purpose of an acid-base buffer is to maintain a relatively constant pH in a solution.
Answer:
Explanation:
The following equation relates to Born-Haber cycle
Where
is enthalpy of formation
S is enthalpy of sublimation
B is bond enthalpy
is ionisation enthalpy of metal
is electron affinity of non metal atom
is lattice energy
Substituting the given values we have
-435.7 = 79.2 + 1/2 x 242.8 + 418.7 - 348 +U_L
= - 707 KJ / mol