From the given salt solution systems, the X − ion that has the weakest conjugate acidand the decreasing order of the basic strength of the given anions, is to be determined. Concept introduction: A salt is a strong electrolyte, which dissociates completely when added to water. When a salt contains an anion that comes from a weak acid then the anion recombines with water to produce a weak acid and hydroxide ions, and forms a basic solution. The cation, if it comes from a strong base, does not recombine and is present in the solution as a free ion without having any effect on the pH of the solution. The reaction of the salt ( BA ) which takes place is: A − ( aq ) + H 2 O ( l ) ⇌ HA ( aq ) + OH − ( aq ) Here, A − comes from the weak acid HA and B + comes from strong base BOH . The pH of this solution is determined by the [ OH − ] The relationship between K b , K a and K w gives the quantitative basis of the reciprocal relationship between the strength of an acid and its conjugate base or vice-versa. K a × K b = K w …… (1) K b is the measure of dissociation of a base and is known as the base-ionization constant, which is specific at a particular temperature. K b = [ OH − ] [ HA ] [ A − ] …… (2)
From the given salt solution systems, the X − ion that has the weakest conjugate acidand the decreasing order of the basic strength of the given anions, is to be determined. Concept introduction: A salt is a strong electrolyte, which dissociates completely when added to water. When a salt contains an anion that comes from a weak acid then the anion recombines with water to produce a weak acid and hydroxide ions, and forms a basic solution. The cation, if it comes from a strong base, does not recombine and is present in the solution as a free ion without having any effect on the pH of the solution. The reaction of the salt ( BA ) which takes place is: A − ( aq ) + H 2 O ( l ) ⇌ HA ( aq ) + OH − ( aq ) Here, A − comes from the weak acid HA and B + comes from strong base BOH . The pH of this solution is determined by the [ OH − ] The relationship between K b , K a and K w gives the quantitative basis of the reciprocal relationship between the strength of an acid and its conjugate base or vice-versa. K a × K b = K w …… (1) K b is the measure of dissociation of a base and is known as the base-ionization constant, which is specific at a particular temperature. K b = [ OH − ] [ HA ] [ A − ] …… (2)
Solution Summary: The author explains the relationship between the strength of an acid and its conjugate base or vice-versa.
From the given salt solution systems, the X− ion that has the weakest conjugate acidand the decreasing order of the basic strength of the given anions, is to be determined.
Concept introduction:
A salt is a strong electrolyte, which dissociates completely when added to water.
When a salt contains an anion that comes from a weak acid then the anion recombines with water to produce a weak acid and hydroxide ions, and forms a basic solution. The cation, if it comes from a strong base, does not recombine and is present in the solution as a free ion without having any effect on the pH of the solution.
The reaction of the salt (BA) which takes place is:
A−(aq)+H2O(l)⇌HA(aq)+OH−(aq)
Here, A− comes from the weak acid HA and B+ comes from strong base BOH. The pH of this solution is determined by the [OH−]
The relationship between Kb, Ka and Kw gives the quantitative basis of the reciprocal relationship between the strength of an acid and its conjugate base or vice-versa.
Ka×Kb=Kw …… (1)
Kb is the measure of dissociation of a base and is known as the base-ionization constant, which is specific at a particular temperature.
43) 10.00 ml of vinegar (active ingredient is acetic acid) is titrated to the endpoint
using 19.32 ml of 0.250 M sodium hydroxide. What is the molarity of acetic acid
in the vinegar? YOU MUST SHOW YOUR WORK.
NOTE: MA x VA = MB x VB
424 Repon Sheet Rates of Chemical Reactions : Rate and Order of 1,0, Deception
B. Effect of Temperature
BATH TEMPERATURE
35'c
Yol of Oh
نام
Time
485
Buret rend
ing(n)
12
194
16.
6
18
20
10
22
24
14
115 95
14738
2158235
8:26 CMS
40148
Total volume of 0, collected
Barometric pressure 770-572
ml
mm Hg
Vapor pressure of water at bath temperature (see Appendix L) 42.2
Slope
Compared with the rate found for solution 1, there is
Using the ideal gas law, calculate the moles of O; collected
(show calculations)
times faster
10
Based on the moles of O, evolved, calculate the molar concentration of the original 3% 1,0, solution (sho
calculations)
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