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3 years ago

A pH scale is used to measure?

Chemistry

2 answers:

Kitty [74]3 years ago

5 0

Answer:

A pH scale is used to measure acidity.

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olga_2 [115]3 years ago

4 0

Answer:

How acidic or alkaline a substance is.

Explanation:

1 = Strong acid e.g. Stomach acid

7 = Neutral e.g. Water

14 = Strong alkaline e.g. Sodium hydroxide

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Hno3 is an Arrhenius what

kondaur [170]

Arrhenius concept just states that if a solution dissociates and forms H+ ions then its and acid, but if it dissociates and forms OH- than it's a base.

So HNO3 would be an acid

6 0

4 years ago

Name two factors that influence the viscosity of a lava flow

mr_godi [17]

Three factors that affect magma viscosity are temperature, composition, and presence of dissolved gases.

6 0

3 years ago

Calculate the pH at 25 degrees celsius of a 0.39 M solution of pyridinium chloride (c5h5nhcl) . Note that pyridine (c5h5n) is a

lutik1710 [3]

Answer:

$pH=2.3$

Explanation:

Hello!

In this case, since pyridinium chloride has a pKb of 8.77 which is a Kb of 1.70x10⁻⁹ and therefore a Ka of 5.89x10⁻⁵ which means it tends to be acidic, we write its ionization via:

$C_5H_5NHCl(aq)+H_2O(l)\rightleftharpoons C_5H_5NCl^-(aq)+H_3O^+(aq)$

Because it is a Bronsted base which donates one hydrogen ion to the water to produce hydronium. Thus, we write the equilibrium expression with the aqueous species only:

$Ka=\frac{[C_5H_5NCl^-][H_3O^+]}{[C_5H_5NHCl]}$

In terms of the reaction extent $x$ , we write:

$5.89x10^{-5}=\frac{x*x}{0.39-x}$

Thus, solving for $x$ we obtain:

$x_1=-0.0048M\\\\x_2=0.0048M$

Clearly the solution is 0.0048 M because to negative values are not allowed, therefore, since it equals the concentration of hydronium which defines the pH, we write:

$pH=-log([H_3O^+])=-log(0.0048)\\\\pH=2.3$

Best regards!

5 0

3 years ago

When you heat a 50.0 L cylinder containing 10.0 moles of oxygen to 333 K, what is the pressure inside? (Use the ideal gas law PV

hoa [83]

Hope this helps you

8 0

3 years ago

2. Hydrocarbons consist of carbon and hydrogen. 5.7 g of a hydrocarbon contains 4.8 g of carbon.

zaharov [31]

Answer:

The molecular formula of the hydrocarbon compound is C₈H₁₈

Explanation:

The type of chemical substance in the question = Hydrocarbon

The mass of the hydrocarbon = 5.7 g

The mass of carbon in the given hydrocarbon (sample) = 4.8 g

The relative molecular mas of the hydrocarbon = 114 g

Therefore, the mass of hydrogen in the sample, H = 5.7 g - 4.8 g = 0.9 g

The ratio of the mass of carbon in the sample = 4.8/5.7

The ratio of the mass of hydrogen in the sample = 0.9/5.7

By the law of constant composition, we have;

The mass of carbon in a mole of the hydrocarbon = (4.8/5.7) × 114 g = 96 g

The molar mass of carbon, C = 12 g/mol

The number of moles of carbon in a mole of the hydrocarbon, 'n₁', is given as follows;

n₁ = 96 g/12 g = 8 moles

The mass of hydrogen in a mole of the hydrocarbon = (0.9/5.7) × 114 g = 18 g

The molar mass of hydrogen, H ≈ 1 g/mol

The number of moles of hydrogen in a mole of the hydrocarbon, 'n₂', is given as follows;

n₂ = 48 g/1 g = 18 moles

Therefore, in each each molecule of the compound, we have have 8 atoms of carbon, 'C', and 18 atoms of hydrogen, 'H'

Therefore, we get;

The molecular formula of the hydrocarbon compound is C₈H₁₈ which is the chemical formula for the hydrocarbon also known as octane

7 0

3 years ago