Ionization constant for acid = Ka
let's assume that monoprotic acid is HA
the reaction between HA and NaOH,
HA(aq) + NaOH(aq) → NaA(aq) + H₂O(l)
the stoichiometric ratio between HA and NaOH is 1 : 1
Hence,
Moles of NaOH added = reacted moles of HA in 25.00 mL
Moles of NaOH added = concentarion x volume added
= 0.104 mol L⁻¹ x 21.70 x 10⁻³ L
reacted moles of HA in 25.00 mL = 0.104 mol L⁻¹ x 21.70 x 10⁻³ L
hence, the initial [HA] = moles / volume
= (0.104 mol L⁻¹ x 21.70 x 10⁻³ L) / 25.00 x 10⁻³ L
= 0.090 M
According to the pH, the molar solubility = [H⁺(aq)] = X
pH = -log[H⁺(aq)]
3.70 = -log[H⁺(aq)]
[H⁺(aq)] = 1.995 x 10⁻⁴ M
X = 1.995 x 10⁻⁴ M
at equilibrium,
HA(aq) ⇄ H⁺(aq) + A⁻(aq)
Initial 0.090
Change -X +X +X
Equilibrium 0.090 - X X X
Ka = [H⁺(aq)] [ A⁻(aq)] / [HA(aq)]
= X x X / (0.090 - X)
= (1.995 x 10⁻⁴ M)² / (0.090 - 1.995 x 10⁻⁴) M
= 4.432 x 10⁻⁷ M
Answer:
This is a physical change.
Explanation:
As long as the identity of the substance has not changed, and the element is present before and after, it is a physical change! (Ex: ice melting)
Answer:
1.Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
2.The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma.
3.For every action there is an equal and opposite reaction.
Hope this Helps!
Pls Mark <em><u>Brainliest</u></em> I just need one more!
Ask your lab manager for instructions. If you happen to be the lab manager, take out the container (making a note of where it is), find the culprit, and try to figure out what might be in the beaker so you can know how to properly dispose of it.
Proper safety measures should be followed.
<h2>
What are the safety measures in chemistry lab?</h2>
In the lab, always use the proper eye protection, such as chemical splash goggles. When handling hazardous items, put on the disposable gloves that the laboratory has given. Before leaving the lab, take the gloves off. Put on a full-length, long-sleeved lab coat (apron) or apron that can withstand chemicals.
To know more about Safety measures, go to the URL
brainly.com/question/8430576
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