Regarding acids, bases, and pH, which of these statements is true? Choose one: A. Substances that release protons when they diss
olve in water are termed acids and result in a pH lower than 7. B. Substances that release protons when they dissolve in water are termed bases and result in a pH lower than 7. C. Substances that release protons when they dissolve in water are termed bases and result in a pH higher than 7. D. Substances that release protons when they dissolve in water are termed acids and result in a pH higher than 7.
2 answers:
Answer: A
Explanation:
An acid is a substance that dissolves in water to produce proton (H +), which then combines with Water molecule (H2O) to give Hydroxonium ion (H3O +).
Acid also have a pH value below 7 on the pH scale.
Answer:
A. Substances that release protons when they dissolve in water are termed acids and result in a pH lower than 7
Explanation:
An acid when in water releases a proton(H+) while the base in water releases an hydroxide(OH- )ion. The hydroxide ion released by the base then accepts the Proton released by the acid.
An acidic substance is known to have a pH of 0-6.9 while basic substances have a pH of 7.1-14.0.
This makes option A correct.
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<h2>Answer: 13985.4 g</h2>
Explanation:
Mass = volume × density
Mass = 652 cm³ × 21.45 g/cm³
= 13985.4 g
Explanation:
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Answer:
HCN
Explanation:
There are several factors that can tell us when an acid is stronger than another, which are the following:
1. The Polarity of the X - H Bond
2. Size of the X atom.
3. Charge on the acid.
4. Oxidation state of the central atom
5. Values of Ka and pKa.
From all of this factors, we can see that the exercise is already giving us values of Ka, and also we have different types of acid, not only with the form H - X
So, we will base the force of an acid by it's pKa value.
The pKa value which is calculated with the expression:
pKa = -logKa
pKa is a value that indicates how strong is the acid you are working with. This value can vary depending on factors such the charge of the acid. I f this charge can be easily distributed in resonance structures, the compound is more acidic, and therefore the pKa value is lower.
The lower the pKa, the more acidic the compound is.
So calculating the pKa on every structure we have:
HF: pKa = -log(3.5x10^-4) = 3.46
HNO2: pKa = -log(4.6x10^-4) = 3.34
HCN: pKa = -log(4.9x10^-10) = 9.31
HCOOH: pKa = -log(1.8x10^-4) = 3.74
HClO2: -log(1.1x10^-2) = 1.96
So according to all this values, we can conclude that the weakest acid is the HCN
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<em>Answer:</em>
- The concentration of new solution will be 1×10∧-7 M.
<em>Solution:</em>
<em>Data Given </em>
given mass of fluoxymesterone =16.8mg = 0.0168 g
molar mass of fluoxymesterone = 336g/mol
vol. of fluoxymesterone = 500.0 ml = 0.500 L
Stock Molarity of fluoxymesterone = (0.0168/336)÷0.500 = 1×10∧-4 M
So applying dilution formula
Stock Solution : New Solution
M1.V1 = M2.V2
( 1×10∧-4 M) × (1×10∧-6 L) = M2 × 0.001 L
[( 1×10∧-4) × (1×10∧-6)]÷[0.001] = M2
1 × 10∧-7 = M2
<em>Result:</em>
- The concentration of new solution M2 will be 1 × 10∧-7
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