The initial pH for the weak acid-strong base curve is higher than the initial pH for the strong acid-strong base curve. Hence, option A is correct.
<h3>What is a weak acid?</h3>
Weak acids are acids that don't completely dissociate in solution.
A weak acid is an acetic acid. It has a of 1.8⋅
. Calculate how much it will dissociate in water. Since acetic acid is a weak acid so large part will not dissociate completely.
![k_a=\frac{[CH_3COO^-]H^+]}{[CH_3COOH]}](https://tex.z-dn.net/?f=k_a%3D%5Cfrac%7B%5BCH_3COO%5E-%5DH%5E%2B%5D%7D%7B%5BCH_3COOH%5D%7D)
B is not true, it shows the titration curve for weak/strong acid titrated with a strong base. When choosing an indicator for colourimetric titration select one so that the pH jump at the equivalence point contains the interval p±1. Phenolphthalein has a p≈9, so to decide if it is a suitable indicator check if the pH jumps from 8 to 10 at the equivalence point.
C is not true either because of the very slow reaction.
Learn more about weak acid here:
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C. (-2,-2) is the answer.
<u>Explanation:</u>
When we reflect a point (x, y) across the y-axis, after the reflection, the y-coordinate tends to be the same, however the x-coordinate is changed into its opposite sign.
Here U(2,-2) is reflected across the y-axis then,
the y-coordinate -2 remains the same and the x-coordinate is transformed into its opposite that is the sign of the x-coordinate will be changed as -2.
So the new coordinates of U after reflection will be (-2,-2).
Answer:
More energy is required to raise its temperature. Therefore, temperature does not stay the same when heat energy increases.
P(total)=P1+P2+P3+...
P(total)=P(N2)+P(others)+P(O2)
100kPa=78kPa+1kPa+P(O2)
P(O2)=100-79=21kPa
Oxygen is the correct answer.
