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2 years ago

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What is a chemical formula?

1 answer:

krek1111 [17]2 years ago

6 0

Answer:

A. An identification of the atoms in a molecule

Explanation:

The chemical formula of a compound is a representation which shows all the elements therein and the mole relationship between them expressed as subscripts.

Therefore, a chemical formula allows us to identify atoms that are within a molecule.

A molecule is a covalent compound that has discrete or separate units.

For example;

HCl represents 1 mole of hydrogen chloride molecules consisting of 1 mole of hydrogen atoms and 1 mole of chlorine atoms.

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How many moles of Cu(OH)2 are soluble in 1L of sodium hydroxide (NaOH) when the pH is 8.23?

Morgarella [4.7K]

Answer:

4.96E-8 moles of Cu(OH)2

Explanation:

Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.

Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.

$pH= -log[H]\\pH= -log (\frac{kw}{[OH]})$

$8.23 = - log(\frac{Kw}{[OH]} \\10^{-8.23} = Kw/[OH]\\ [OH] = Kw/10^{-8.23}$

$[OH]=1.69E-6$

This concentration of OH affects the disociation of Cu(OH)2. Let us see the dissociation reaction:

$Cu(OH)_2 -> Cu^{2+} + 2OH^-$

In the equilibrum, exist a concentration of OH already, that we knew, and it will be added that from dissociation, called "s":

The expression for Kps is:

$Kps= [Cu^{2+}] [OH]^2$

The moles of (CuOH)2 soluble are limitated for the concentration of OH present, according to the next equation.

$Kps= s*(2s+1.69E-6)^2$

"s" is the soluble quantity of Cu(OH)2.

The solution for this third grade equation is $s=4.96E-8 mol/L$

Now, let us calculate the moles in 1 L:

$moles Cu(OH)_2 = 4.96E-8 mol/L * 1 L = 4.96E-8 moles$

7 0

3 years ago

What temperature in fahrenheit is 28 degrees below freezing?

babunello [35]

28 degrees below freezing would be 4 degrees

4 0

2 years ago

How many atoms of oxygen does the chemical formula show?<br> Al(HSO4)3

galina1969 [7]

Answer:

This formula contains 12 oxygen atoms.

6 0

2 years ago

How many moles of sodium hydrogen carbonate are present in 2.61 grams of this compound?

Sloan [31]

Molar mass of NaHCO_3

23+1+12+3(16)
36+48
84g/mol

Now

$\\ \sf\longrightarrow No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}$

$\\ \sf\longrightarrow No\:of\; moles=\dfrac{2.61}{84}$

$\\ \sf\longrightarrow No\:of\:moles=0.0312mol$

7 0

1 year ago

A solution with a ph of 13 contains what concentration of hydroxyl ions [oh-]?

Sedbober [7]

A solution with pH of 8 and above is basic so definitely OH-

8 0

2 years ago