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Marizza181 [45]
2 years ago
10

Why does the pH of the acid solution initially increase very slowly when metal is first added to the acid solution, but graduall

y increase at a faster rate as the reaction proceeds to completion?
I thought it may be because the metal is just then being completely dissolved but that didn't make sense because we were instructed to wait until the first little scoop of the metal powder was dissolved before adding the next bit.
Chemistry
1 answer:
aleksandr82 [10.1K]2 years ago
5 0
When a metal reacts with an acid, say HCl, it reacts with the H+ atoms of the acid to produce H2 gas and chloride ions. Since pH is the negative log of H+ concentration, then it would sensibly decrease because it was used up. The metal oxide would form a coating over the metal. However, as the reaction proceeds, the acid corrodes the metal and exposes a purer surface removing the coating. Thus increasing the concentration of H+.
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Helium gas in a cylinder is under 1.12atm pressure at 25.0C. What will be the pressure if the temperature increases to 37.0C?
Irina18 [472]

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p_2=1.17atm

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In this case, considering that the Gay-Lussac's law allows us to relate the temperature-pressure problems as directly proportional relationships:

\frac{p_2}{T_2} =\frac{p_1}{T_1} \\\\

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p_2=\frac{p_1T_2}{T_1} \\\\p_2=\frac{1.12atm*310.15K}{298.15K}\\\\p_2=1.17atm

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CH3 CH(CH3)CH2 CH2 CH2 CH2 CH(CH3) CH3

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6 0
3 years ago
What is the concentration of a solution with a volume of 660L that contains 33.4g of AlCO3?
lana [24]

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The concentration of the solution is 5.8168 × 10^{-4} mol.dm^{-3}

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Here, we want to calculate the concentration of the solution.

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So the first thing to do here is to calculate the number of moles of the solute present, which is the number of moles of AlCO3

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x * 660 = 0.384 * 1

x = 0.384/660 = 0.00058168 = 5.8168 * 10^-4 mol/dm^3

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