Answer:
pH = 1.348
Explanation:
- H2SO3 + H20 ↔ H3O+ + HSO3-
∴ Ka1 = 1.7 E-2 = ( [ H3O+ ] * [ HSO3- ] ) / [ H2SO3 ]
∴ <em>C </em>H2SO3 (aq) = 0.163 M
- HSO3- + H2O ↔ H3O+ + SO32-
∴ Ka2 = 6.4 E-8 = ( [ H3O+ ] * [ SO32- ] ) / [ HSO3- ]
∴ Kw = 1 E-14 = [ H3O+ ] * [ OH- ]
since Ka1 >>> Ka2 ( difference between the constants is greater than the order of E3 ); then the most importan equilibrium is Ka1 and we can assume that [ SO32- ] <<< [ HSO3- ]
mass balance:
⇒ <em>C </em>H2SO3 = 0.163 = [ H2SO3 ] + [ HSO3- ]......(1)
charge balance:
⇒ [ H3O+ ] = [ HSO3- ]...........(2) where [ OH- ] and [ SO32- ] is neglected. the first comes from water and the second comes from Ka2.
(2) in (1):
⇒ [ H2SO3 ] = 0.163 - [ H3O+ ]......(3)
(2) and (3) in Ka1:
⇒ 1.7 E-2 = [ H3O+ ]² / ( 0.163 - [ H3O+ ] )
⇒ [ H3O+ ]² + 1.7 E-2 [ H3O+ ] - 2.771 E-3 = 0
⇒[ H3O+ ] = 0.045 M
⇒ pH = - Log [ H3O+ ] = - Log ( 0.045 )
⇒ pH = 1.348
Answer:
It's a list of metals from most to least reactive.
Explanation:
You should be able to find it listed really easily online.
Answer:
No, it does not follow
Explanation:
The law of consevation of matter states that matter can neither be created nor destroyed. Hence, in a closed system involving a physical or chemical reaction, the amount of matter (mass) present in the reactants must equate the amount of matter in the products.
i.e. mass of reactants = mass of products
In the chemical reaction in the image, sodium reacts with hydrogen chloride (reactants) to give sodium chloride and hydrogen gas (products). That is,
Na(s) + HCl(aq) ------> NaCl(aq) + H2(g)
According to the image, the mass of Na= 14.25g, HCl= 9.50g, {NaCl + H2} = 22.98g
The mass of the reactants is 14.25+9.50= 23.75g
Mass of products= 22.98g
The mass of reactants and products are not equal and hence, does not follow the law of conservation of matter.
The answer to your question is C