All categories

2 years ago

Why is a solution that is 0.10M HCN and 0.10M LiCN considered a good buffer system?

1 answer:

const2013 [10]2 years ago

8 0

Because of the common ion effect. Adding a common ion decreases the solubility of the salt which is the intention of a buffer.

You might be interested in

Which of the following statements best describes an animal impacting the hydrologic cycle?

Katena32 [7]

Answer:

When an animal breathes out, water vapor from inside the animal's lungs is released into the air.

Explanation:

The hydrologic cycle is the cycle of water movement throughout the environment. A is the only only one that "recycles" water;

5 0

2 years ago

Buffering capacity refers to: the effectiveness of commercial antacids the extent to which a buffer solution can counteract the

kirill [66]

Answer: Option (b) is the correct answer.

Explanation:

Buffere is defined as the solution to whom when an acid or base is added then it resists any in change in pH of the solution.

This is because a buffer has the ability to not get affected by the addition of small amounts of an acid or a base. So, basically it keeps the concentration of both hydrogen ions and hydroxides equal. As a result, it helps in maintaining the pH of the solution.

And, the capacity of a buffer solution to resist the change is known as buffer capacity.

Thus, we can conclude that buffering capacity refers to the extent to which a buffer solution can counteract the effect of added acid or base.

8 0

2 years ago

Which is true of binary ionic compounds?

Dmitry [639]

Answer:

Its a or d if im stupid my b

Explanation:

4 0

2 years ago

3. The same well water contains dissolved calcium (Ca), magnesium (Mg), sodium (Na) and potassium (K) at 5.0, 1.0, 136 and 1.2 m

Verdich [7]

Answer: The concentration of calcium, magnesium, sodium and potassium are $1.25\times 10^{-4}mol/L$ , $4.20\times 10^{-5}mol/L$ , $5.91\times 10^{-3}mol/L$ and $3.08\times 10^{-5}mol/L$ respectively

Explanation:

To convert the mass from milligrams to grams, we use the conversion factor:

1 g = 1000 mg

To convert the given concentration fro grams to moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For Calcium:

Concentration given = 5.0 mg/L = $5.0\times 10^{-3}g/L$

We know that:

Molar mass of calcium element = 40 g/mol

Putting values in equation 1, we get:

$\text{Concentration in mol/L}=\frac{5.0\times 10^{-3}g/L}{40g/mol}\\\\\text{Concentration in mol/L}=1.25\times 10^{-4}mol/L$

For Magnesium:

Concentration given = 1.0 mg/L = $1.0\times 10^{-3}g/L$

We know that:

Molar mass of magnesium element = 24 g/mol

Putting values in equation 1, we get:

$\text{Concentration in mol/L}=\frac{1.0\times 10^{-3}g/L}{24g/mol}\\\\\text{Concentration in mol/L}=4.20\times 10^{-5}mol/L$

For Sodium:

Concentration given = 136 mg/L = $136\times 10^{-3}g/L$

We know that:

Molar mass of sodium element = 23 g/mol

Putting values in equation 1, we get:

$\text{Concentration in mol/L}=\frac{136\times 10^{-3}g/L}{23g/mol}\\\\\text{Concentration in mol/L}=5.91\times 10^{-3}mol/L$

For Potassium:

Concentration given = 1.2 mg/L = $1.2\times 10^{-3}g/L$

We know that:

Molar mass of potassium element = 39 g/mol

Putting values in equation 1, we get:

$\text{Concentration in mol/L}=\frac{1.2\times 10^{-3}g/L}{39g/mol}\\\\\text{Concentration in mol/L}=3.08\times 10^{-5}mol/L$

Hence, the concentration of calcium, magnesium, sodium and potassium are $1.25\times 10^{-4}mol/L$ , $4.20\times 10^{-5}mol/L$ , $5.91\times 10^{-3}mol/L$ and $3.08\times 10^{-5}mol/L$ respectively

3 0

3 years ago

Which substance can be classified as an Arrhenius Acid?

xxMikexx [17]

Answer:

B

Explanation:

An Arrhenius Acid is a substance that dissociates in water to form Hydrogen (H⁺) ions.

Let's write the dissociation reactions of each of the options :

⇒ KF = K⁺ + F⁻

⇒ HF = H⁺ + F⁻

⇒ KOH = K⁺ + OH⁻

⇒ LiH = Li⁺ + H⁻

Only HF forms a Hydrogen ion on dissociation, hence it is the Arrhenius Acid.

7 0

1 year ago

Read 2 more answers