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3 years ago

The concentration of hydronium ions is greater than 1x10-7 for basic solutions

1 answer:

8 0

FALSE

Concentration (M)= mol of substance/ given liter

OH- is hydroxide, a BASE
> proton acceptor
> produce hydroxide ions when dissolved in solution
H3O+ is hydronium, an ACID
> proton (H+) donor
> produce hydrogen ions when dissolved in solution

For more BASIC solutions:
concentration of BASE> con. of ACID
con. OH- > con. H3O+

The concentration of H3O+ must be less than or SMALLER than 1x10^-7 (so 1x10^-8, 1x10^-9 etc.) whereas the concentration of the base, OH-, must be LARGER than 1x10^-7. So there is a higher concentration of OH-, or more mol OH per L of solution.

pH measure the concentration of H+ or H3O+ ions in solution. It is -log[H+] ... so if the concentration was lower than 1x10^-7 mol/ L
-log(1x10^-8)= pH= 8 which is Basic (x>7)

Remember, for the pH scale,
(0-7)= acidic
7= neutral
(7-14)= basic

Conversely, for acidic solutions, the concentration of hydronium would increase

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VARVARA [1.3K]

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2 years ago

A reaction generates hydrogen gas (H) as a product. The re-

Amiraneli [1.4K]

Answer: The average rate of the reaction is $7.82\times 10^{-3}M/min$

Explanation:

To calculate the molarity of hydrogen gas generated, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Moles of hydrogen gas = $3.91\times 10^{-2}mol$

Volume of solution = 250 mL = 0.250 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$\text{Molarity of }H_2=\frac{3.91\times 10^{-2}mol}{0.250L}=0.1564M$

Average rate of the reaction is defined as the ratio of concentration of hydrogen generated to the time taken.

To calculate the average rate of the reaction, we use the equation:

$\text{Average rate of the reaction}=\frac{\text{Concentration of hydrogen generated}}{\text{Time taken}}$

We are given:

Concentration of hydrogen generated = 0.1564 M

Time taken = 20.0 minutes

Putting values in above equation, we get:

$\text{Average rate of the reaction}=\frac{0.1564M}{20.0min}\\\\\text{Average rate of the reaction}=7.82\times 10^{-3}M/min$

Hence, the average rate of the reaction is $7.82\times 10^{-3}M/min$

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3 years ago

Does a helium balloon have a larger volume when it is heated or cooled?

Nadusha1986 [10]

Heated, it shrinks when cooled

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3 years ago

One success of Johann Döbereiner's law of triads was that it organized most of the known elements into three-element groups base

jenyasd209 [6]

That statement is true

it was easy to organize 'all' the elements in a group of threes because back then they only knew about 15 - 20 elements

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3 years ago

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By using the following reactions, calculate the heat of combustion of pentane:

Sergio [31]

To answer this problem, we use Hess' Law to calculate the overall enthalpy of the reactions. The goal is to add all the reactions such that the final reaction is C5H12 (g) + 8O2 (g) → 5CO2 (g) + 6H2O (l) through cancellation adn multiplication. The first equation is multiplied by 5, the second one is multiplied by 6 and the third one is reversed. The final answer is -3538 J or -3.54 x10^3 kJ.

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3 years ago