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S_A_V [24]
3 years ago
14

When a pH probe is inserted into a solution containing the chloride ion it is neutral. What is the pH of a solution containing t

he fluoride ion? View Available Hint(s) When a pH probe is inserted into a solution containing the chloride ion it is neutral. What is the pH of a solution containing the fluoride ion? The solution will be weakly acidic The solution will be weakly basic The solution will be strongly basic The solution will be neutral. The solution will be strongly acidic. Submit Part B The Ka of NH4+ is 5.6 × 10−10. The Kb of CN− is 2 × 10−5. The pH of a salt solution of NH4CN would be: View Available Hint(s) The of is . The of is . The pH of a salt solution of would be: Less than 7 because NH4+ is a stronger acid than CN− is a base. Greater than 7 because CN− is a stronger base than NH4+ is an acid Less than 7 because CN− is a stronger base than NH4+ is an acid. Greater than 7 because NH4+ is a stronger acid than CN− is a base. Submit Provide Feedback
Chemistry
1 answer:
vivado [14]3 years ago
3 0

Answer:

a. the solution will be weakly basic.

b. Greater than 7 because CN⁻ is a stronger base than NH₄⁺ is an acid.

Explanation:

a. The fluoride ion (F⁻) reacts with water thus:

F⁻ + H₂O → HF + OH⁻

That means that fluoride ions produce OH⁻ ions in solution doing <em>the solution will be weakly basic.</em>

b. The acidic equilibrium of NH₄⁺ is:

NH₄⁺ ⇄ NH₃ + H⁺ with a ka of 5,6x10⁻¹⁰.

The basic equilibrium of CN⁻ is:

CN⁻ + H₂O → HCN + OH⁻ with a kb of 2x10⁻⁵

That means that the production of OH⁻ from CN⁻ is higher than production of H⁺ from NH₄⁺. The CN⁻ is a stronger base than NH₄⁺ is an acid.

Thus, the pH of a salt solution of NH₄CN would be <em>Greater than 7 because CN⁻ is a stronger base than NH₄⁺ is an acid.</em>

<em></em>

I hope ot helps!

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A gas evolved during the fermentation of sugar was collected. After purification its volume was found to be 25.0 l at 22.5°c and
Ludmilka [50]

Answer:

Moles of gas collected = 0.952 mole

Explanation:

To calculate the number of moles of the gas collected, we use the equation given by ideal gas which follows:

PV=nRT

where,

P = pressure of the gas = 702 mmHg  

V = Volume of the gas = 25.0 L

T = Temperature of the gas = 22.5^oC=[22.5+273.15]K=295.65\ K

R = Gas constant = 62.3637\text{ L.mmHg }mol^{-1}K^{-1}

n = number of moles of gas = ?

Putting values in above equation, we get:

702\ mmHg\times 25.0\ L=n\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 295.65\ K\\\\n=\frac{702\times 25}{62.3637\times 295.65}\ mol=0.952mol

<u>Moles of gas collected = 0.952 mole</u>

5 0
3 years ago
10.0 grams of a gas occupies 12.5 liters at a pressure of 42.0 mm Hg. What is the volume when the pressure has increased to 75.0
Yanka [14]

 To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

 

P1V1 =P2V2

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V2 = 42.0 x 12.5 / 75.0

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3 0
3 years ago
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Explanation:

According to the electronegativity table, whenever there a difference of more than 2.0 then the bond formed will be ionic in nature. On the other hand, if electronegativity difference is less than 0.5 then the bond formed will be non-polar covalent in nature.

As it if given that electronegativity difference of given elements will be as follows.

        Electronegativity difference = 3.1 - 0.9

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Since, the electronegativity difference of given elements is 2.2. Hence, these elements will form an ionic bond.

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3 years ago
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Net ionic equation: 2Na(s) + 2H⁺(aq) → 2Na⁺(aq) + H₂(g).

Sodium is oxidized from oxidation number 0 (Na) to oxidation number +1, hydrogen is reduced from oxidation number +1 to oxidation number 0 (hydrogen gas H₂).

Another example:

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Word equation: zinc + hydrochloric acid → zinc chloride + hydrogen gas

More about hydrogen gas:brainly.com/question/24433860

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The periodic law states that "The properties of elements are a function of their atomic number".

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learn more:

Periodic table brainly.com/question/8543126

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