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2 years ago

the titration of a polyprotic acid with sufficiently different pka 's displays two equivalence points. why?

1 answer:

4 0

If Ka1 and Ka2 are sufficiently distinct and a polyprotic acid is titrated with a strong base, the pH curve will contain two equivalence points because the two acidic protons will be titrated sequentially.

<h3>What is titration?</h3>

Titration is a method of chemical analysis in which the amount of a sample's constituents is determined by adding a precise amount of a different substance—one that the desired constituent reacts with in a specific, known proportion—to the sample being tested.

The titrating reagent, or titrant, is gradually added to the process using a standard solution (i.e., a solution of known concentration), which is administered using a burette, which is essentially a long, graduated measurement tube with a stopcock and a delivery tube at its bottom end. The addition comes to an end at the comparable point.

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Cars run on gasoline, where octane (C8H18) is the principle component. This combustion reaction is responsible for generating en

Bezzdna [24]

Answer:

10.19 g CO₂

4.69 g H₂O

Explanation:

The combustion reaction of Octane is:

C₈H₁₈ → 8CO₂ + 9H₂O

To calculate the mass of CO₂ and H₂O produced, we need to know the mass of octane combusted.

We calculate the mass of Octane from the given volume and density, using the following conversion factors:

1 gallon = 3.785 L

1 L = 1000 mL

Now we convert 1.24 gallons to mL:

1.24 gallon * $\frac{3.785L}{1gallon} *\frac{1000mL}{1L} =$ 4693.4 mL

We calculate the mass of Octane:

4693.4 mL * 0.703 g/mL = 3.30 g Octane

Now we use the stoichiometric ratios and molecular weights to calculate the mass of CO₂ and H₂O:

CO₂ ⇒ 3.30 g Octane ÷ 114g/mol * $\frac{8molCO_{2}}{1molOctane}$ * 44 g/mol = 10.19 g CO₂

H₂O ⇒ 3.30 g Octane ÷ 114g/mol * $\frac{9molH_{2}O}{1molOctane}$ * 18 g/mol = 4.69 g H₂O

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Which of these is the strongest acid?

sergejj [24]

Answer: D

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Choose all true statements about the water molecule: Choose all true statements about the water molecule: Bonding between the ox

amm1812

Answer: Water is a permanent electric dipole, having permanent charge separation.

Explanation:

Hydrogen bonding is an intermolecular force having partial ionic-covalent character.

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