Ejercicios sobre análisis gravimétrico y análisis volumétrico.
1. determine la concentración molar de disolución de naoh que
se requieren para neutralizar 0.546 g de khp si se gastaron
23.4 ml de naoh
2. calcule la constante de equilibrio para el siguiente caso: se
prepara 1l de una solución que contiene 3.00 moles de ácido
benzoico (c6h5cooh), 6.00 moles de etanol (c2h5oh) y agua.
cuando se obtiene el equilibrio se producen 1.25 moles de
benzoato de etilo (c6h5cooc2h5), como se muestra en la
siguiente reacción:

ayuda con procedimiento y

1) Answer is: 0,114 mol/L.
Chemical reaction: KHP + NaOH → KPNa + H₂O.
m(KHP) = 0,546 g.
V(NaOH) = 23,4 mL = 0,0234 L.
c(NaOH) = ?
n(KHP) = m(KHP) ÷ M(KHP).
n(KHP) = 0,546 g ÷ 204,22 g/mol.
n(KHP) = 0,00267 mol.
From chemical reaction: n(KHP) : n(NaOH) = 1 : 1.
n(NaOH) = 0,00267 mol.
c(NaOH) = n(NaOH) ÷ V(NaOH).
c(NaOH) = 0,00267 mol ÷ 0,0234 L.
c(NaOH) = 0,114 mol/L = 0,114 M.
KHP - potassium hydrogen phthalate. 
2) Answer is: Ke = 0,1879.
Chemical reaction: C₆H₅COOH + C₂H₅OH → C₆H₅COOC₂H₅ + H₂O.
c₀(C₆H₅COOH) = n₀(C₆H₅COOH) ÷ V(C₆H₅COOH).
c₀(C₆H₅COOH) = 3 mol ÷ 1L
c₀(C₆H₅COOH) = 3 mol/L.
c₀(C₂H₅OH) = n₀(C₂H₅OH) ÷ V(C₂H₅OH).
c₀(C₂H₅OH) = 6 mol ÷ 1L. 
c₀(C₂H₅OH) = 6 mol/L.
c₁(C₆H₅COOC₂H₅) = 1,25 mol/L.
c₁(C₆H₅COOH) = 3 mol/L - 1,25 mol/L = 1,75 mol/L.
c₁(C₂H₅OH) = 6 mol/L - 1,25 mol/L = 4,75 mol/L.
c₁(H₂O) = c₁(C₆H₅COOC₂H₅) = 1,25 mol/L.
Ke = c₁(C₆H₅COOC₂H₅) · c₁(H₂O) / c₁(C₆H₅COOH) · c₁(C₂H₅OH).
Ke = 1,25 mol/L · 1,25 mol/L / 1,75 mol/L · 4,75 mol/L.
Ke = 0,1879.

"I, Too" by Langston Hughes- references a Walt Whitman work, uses free verse.

"From the Dark Tower" by Countee Cullen- paradox of social injustice, uses set meter and rhyme scheme, symbol of wasted efforts.

Explanation:

"I, Too" by Langston Hughes is a reference or rather a response to Walt Whitman's poem "I Hear America Singing". Whitman's poem talks about the diverse professions "singing" together which makes up the great nation of America. But while including people from all professions, be it the mechanics, carpenter, or woodcutter, signifying the importance of any job that one is doing, he did not include that of the slaves which Hughes uses in his poem to respond to Whitman's poem. In his poem, Hughes centralizes the young black slave, suggestive of his American nationality.

This poem also has no specific rhyme scheme or meter, thus making it a free-verse poem.

Countee Cullen's poem "From the Dark Tower" shows a paradox of injustice when the poem talks of how others reap the fruits of someone else's hard work. This poem also shows a symbol of wasted effort for those whose works are taken by others. And the poem uses a set meter and rhyme scheme, for the poem is written in the ABBA rhyme scheme twice in the first stanza.