A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution? Useful formulas..
Answers
The concentration of hydroxideions in the given aqueous solution is equal to 6.3 ×10⁻³ M.
What is the pOH?
pOH can be calculated from the negative logarithm of the concentration of hydroxideions in the given aqueous solution.
Mathematically, the formula of the pOH can be represented as shown below:
pOH = - log ([OH⁻ ])
and pH + pOH = 14 ..............(1)
Where [OH⁻] is representing the concentration of hydroxide ions in an aqueous solution.
Given, the value of the pH of the ammonia solution, pH = 11.8
Substitute the value of the pH in equation (1):
pH + pOH = 14
11.8 - log [OH⁻] = 14
- log [OH⁻] = 14 -11.8
log [OH⁻] = - 2.2
[OH⁻] = 6.3 × 10⁻³ M
Therefore, the concentration of the hydroxideions is equal to 6.3 ×10⁻³ M.
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pH + pOH = 14
Solve for pOH and you get:
pOH = 14 - pH
Replace the pH with it's value:
pOH = 14 - 11.8
pOH = 2.2
Now that you have the pOH you can find the concentration of OH- ions with this formula:
pOH = -log[OH-]
Solve the formula for [OH-] and you get:
[OH-] = 10^(-pOH)
Now replace pOH with it's value:
[OH-] = 10^(-2.2)
[OH-] = 0.006309 M
The concentration of OH- atoms is 0.006309M or in the scientific notation 6.309×10^(-3)M
Related Questions
What is the molarity of a solution that is made by adding 57.3 g of MgO to 500.0 mL of solutions
In liquid water, an equilibrium exists between H2O(ℓ) molecules, H+(aq) ions, and OH−(aq) ions. A person experiencing acid indigestion after drinking tomato juice can ingest milk of magnesia to reduce the acidity of the stomach contents. Tomato juice has a pH value of 4. Milk of magnesia, a mixture of magnesium hydroxide and water, has a pH value of 10.Complete the equation in your answer booklet for the equilibrium that exists in liquid water.
Which equations shows the complete dissociation of a strong base? HCl -> cl- + H+ HNO2 -> H+ + NO2- HA + h20 -> A- + H+ + h20 BOH + h20 -> B+ + OH- + H20
During which process is water produced?a. alcohol fermentationb. acetyl CoA formationc. electron transport chaind. citric acid cycle
lactase lowers the activation energy needed to begin breaking down lactose.
lactase releases heat during the breakdown of lactose.
lactase prevents too many disaccharide molecules from clumping together during chemical reactions
Answers
The lactase enzyme lowers the activation energy required to begin breaking down lactose. Therefore, option (B) is correct.
What is lactase enzyme?
The lactase enzyme is a part of the β-galactosidase family, found along the membrane of villi in the small intestine.
In the human body, the optimum temperature and pH for lactase are 37 ° C and 6 pH respectively. Lactase helps in the complete digestion of milk in the small intestine in the human body.
The lactase enzyme catalyzes the hydrolysis of the β-glycosidic bond of D-lactose. After the completion of the hydrolysis, D-glucose and D-galactose are obtained.
The lactase provides the path of low activation energy to initiate the breakdown of the lactose.
Therefore, option (B) is correct that lactase lowers the activation energy.
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Answers
Answer: Option (b) is the correct answer.
Explanation:
Elements which belong to same group show similar chemical properties.
This is because elements which are present in the same group have same number of valence electrons. Hence, they tend to show same type of reactivity which makes them exhibit similar chemical properties.
As chemical properties are defined as the properties which tend to show difference in chemical composition of a substance.
For example, toxicity, reactivity, combustion etc are all chemical properties.
Here, oxygen and sulfur are both group 16 elements. So, they tend to show similar chemical properties.
Thus, we can conclude that oxygen and sulfur elements have the most similar chemical properties.
Final answer:
Among the given pairs, oxygen and sulfur display the most similar chemical properties because they are in the same group of the periodic table (Group 16, or the chalcogens), and thus have the same number of valence electrons (six), leading to similar chemical reactivity.
Explanation:
Among the pairs of elements presented in the original question (boron and carbon, oxygen and sulfur, aluminum and bromine, argon, and silicon), the pair that has the most similar chemical properties is oxygen and sulfur. This is due to their placement within the same group on the periodic table, specifically the chalcogens, or Group 16.
Elements in the same group of the periodic table typically exhibit similar chemical properties because they have the same number of valence electrons. For example, boron and carbon, although neighbors on the periodic table, do not exhibit highly similar chemical properties due to their different numbers of valence electrons.
On the other hand, oxygen and sulfur, both being members of Group 16, have six valence electrons and thus exhibit similar chemical reactivity and form similar types of compounds, despite their differences in physical properties.
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Answers
Answer:
The atomic mass is the weighted average of all the naturally occurring isotopes of the element.
Explanation:
A. The atomic mass is the weighted average of all the naturally occurring isotopes of the element. YES. Since there can be several different isotopes of the same element, the weighted average is used in the periodic table to reflect the likely composition of a random sample.
B. The atomic mass is determined by the number of protons in the nucleus. NO
C. The atomic mass is a whole number, but it appears as a fraction due to rounding in the periodic table. NO.
D. The atomic mass is a decimal number because it represents the total number of electrons in the atom. NO.
c. condensation
b. sublimation
d. solidification
Answers
The answer to your question
b. sublimation
(2) Group 2 (4) Group 17
Answers
The oxidation state of an element is calculated by subtracting and the total sum of oxidation states of all the individual atom (excluding the one that has to be calculated) from total charge on the molecule. Option (1) is correct option.
What is oxidation state?
Oxidation state of an element is a number that is assigned to an element in a molecule that represents the number of electron gained or lost during the formation of that molecule or compound. Oxidation state is a unitless quantity.
Oxidation state of M in M₂O is:
Let oxidation state of M be X
Oxidation state of Oxygen is -2
Overall charge on the molecule is 0
so 2X+(-2)=0
X=+1
So from here we can see that oxidation state of M is +1 which is possessed only by group 1 element
Hence option (1) is correct option.
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Therefore, (1) Group 1 is the correct answer because elements in group 1 have 1 valence electron.
Hope this helps~
greater molecular size of water
2.
stronger hydrogen bonding in water
3.
higher molarity of water
4.
larger gram-formula mass of water
Answers
has higher boiling point than
, as there has been stronger hydrogen bonding in
. Thus, option 2 is correct.
The boiling point has been the temperature at which the liquid has been converted to the gaseous form. The boiling point has been based on the intemolecular attractions between the atoms.
Higher boiling point
Based on the intermolecular interactions, the compound with higher intermolecular force required more energy to break the bond and change the state, and thus have high boiling point.
The hydrogen sulfide and water has hydrogen bonding. The hydrogen bonding has been based on the electronegativity of the atom involved. The more electronegative atom, stronger will be hydrogen bonding and thereby higher boiling point.
In and
, the oxygen has been more electronegative than sulfur and thus results in stronger hydrogen bonding.
Thus, has higher boiling point than
, as there has been stronger hydrogen bonding in
. Thus, option 2 is correct.
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Answer:
2, stronger hydrogen bonding
Explanation: