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This tag should be applied to questions concerning acid and base reactions. An acid is capable of donating a hydron/ proton (Brønsted acid) or capable of forming a covalent bond with an electron pair (Lewis acid). A base on the other hand is a chemical species/ molecular entity having an available pair of electrons capable of forming a covalent bond with a hydron/ proton (Brønsted base) or with the vacant orbital of some other species (Lewis base).

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The initial acid concentration is $\ce{C(HA)}=0.5\ \mathrm{M}$. The weak dissociation of the acid follows: $$\ce{HA(aq) + H2O(l) <=> H3O+(aq) + A-(aq)}$$ We'll ignore the auto-dissociation of water …
answered Dec 9 '17 by Gert
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Firstly, "$\ce{NH4OH}$" doesn't really exist. Ammonia solutions generate hydroxide ions via: $$\ce{NH3(aq) + H2O(l) -> NH4+(aq) + OH-(aq)}$$ The equilibrium constant $K_b$ is given by: $$K_b=\frac{ …
answered Jan 3 '18 by Gert
4
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It's the citric acid that reacts with the sodium bicarbonate. When the tablet hits the water, the citric acid and bicarbonate react, forming $\ce{CO2}$ and sodium citrate. This causes the tablet to br …
answered Nov 16 '17 by Gert
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The notation $pSomething$ is somewhat old and probably dates back to the use of logarithm tables. The $p$ notation simply means "Take the negative logarithm of what follows the p". Example: let the …
answered Nov 19 '17 by Gert
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You've done quite well there. You correctly calculated the number of moles of acid in the original solution as: $$n(\ce{HA}) = C(\ce{NaOH}) \times V_2$$ After the first addition of base, the number …
answered Dec 8 '17 by Gert
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Yes, mineral acids like $\ce{H3PO4}$ react with electropositive metals like zinc to produce dihydrogen gas ($\ce{H2}$). The quantities generated of course depend on how much metal is being dissolved …
answered Dec 8 '17 by Gert
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While you've generally done a good job, you've made an important error. The hydrolysis of the cyanide ion should be written as an equilibrium reaction: $$\ce{CN-(aq) + H2O(l) <=> HCN(aq) + OH-(aq)}$ …
answered Nov 30 '17 by Gert
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Neither hydrogen chloride ($\ce{HCl}(g)$) nor hydrochloric acid ($\ce{HCl}(aq)$) are capable of oxidising iron to the ferric state ($\ce{Fe^3+}$) but in the presence of oxygen (air) the ferrous ions i …
answered Feb 6 '18 by Gert
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Let the anhydrous acid be $\ce{HA}$ and assume its Molar Mass to be $X$. There is no a priori reason to assume $\ce{A}$ is a mere element. The copper salt in question is $\ce{CuA2.3H2O}$. Its Molar …
answered Dec 28 '17 by Gert