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3 years ago

Which of the following is an example of an Arrhenius base? KCl Ca(OH)2 HCl

1 answer:

3 0

An Arrhenius base is a substance that when dissolved in an aqueous solution, increases the concentration of hydroxide (-OH) in the solution. When Ca(OH)2 dissolves in water: Ca(OH)2 ⇒ Ca2- + 2OH-, thus increases the concentration of OH, so Ca(OH)2 is an Arrhenius base. KCl⇒K+ + Cl-, HCl⇒H+ +Cl-, they both don't increase -OH concentration, so they are not Arrhenius base. In fact HCl is an Arrhenius acid.

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What is the concentration (in M) of a 225ml potassium sulfate solution that contains 4.15g of potassium?

mars1129 [50]

The concentration of solution in M or mol/L can be calculated using the following formula:

$C=\frac{n}{V}$ .... (1)

Here, n is number of moles and V is volume of solution in L.

The molecular formula of potassium sulfate is $K_{2}SO_{4}$ thus, there are 2 moles of potassium in 1 mol of potassium sulfate.

1 mol of potassium will be there in 0.5 mol of potassium sulfate.

Mass of potassium is 4.15 g, molar mass is 39.1 g/mol.

Number of moles can be calculated as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass

Putting the values,

$n=\frac{(4.15 g}{(39.1 g/mol}=0.1061 mol$

Thus, number of moles of $K_{2}SO_{4}$ will be $0.1061\times 0.5=0.053 mol$ .

The volume of solution is 225 mL, converting this into L,

$1 mL=10^{-3}L$

Thus,

$225 mL=0.225 L$

Putting the values in equation (1),

$C=\frac{(0.053 mol}{0.225 L}=0.236 M$

Therefore, concentration of potassium sulfate solution is 0.236 M.

4 0

3 years ago

•What was the physical property used by mendeleev<br> in creating his periodio table?<br>Answer!

Vsevolod [243]

Answer:

Explanation: Mendeleev arranged the elements on the basis of their atomic mass. Melting and boiling point were used as the physical characteristics in deciding the position of elements. He arranged the elements and wrote the formula of their oxides and hydrides which seemed to possess same chemical formula.

Explanation:

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4 years ago

What are 3 ways living creatures use carbohydrates

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Food, Storage, and Structure

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3 years ago

Z=3 1s2 express answer as an ion

sashaice [31]

Answer:

The element with electronic configuartion 1s² and atomic number 3 must be an cation.

Explanation:

The "Z" shows the atomic number. Z stand for zahl. It Is German word and meaning is " number".

In given question Z is equal to three which means an element with atomic number three.

Let consider the X is an element with atomic number three having electronic configuration 1s², but according to this atomic number there should be one more electron present is 2s. If X has the electronic configuration 1s² it means that it lose one electron and X is present in the form of cation.

X⁺ = 1s²

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3 years ago

What will happen if water at 50 degree is cooled to -10 degree?

Veseljchak [2.6K]

The temperature will be lower and the water could either become really cold or freeze. I can't exactly tell you because you're not saying if it's Celsius or Fahrenheit. <span />

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3 years ago