Topic
Q:
(e) What would be observed when aqueous sodium hydroxide is added to a
sample of the aqueous industrial waste until no further change is seen?
Q:
Kps do AgBr a \( 25^{\circ} . \mathrm{C} \) é igual a \( 4,9 \times \)
\( 10^{-13} \). Calcule a sua solubilidade em
\( \mathrm{mol} / \mathrm{L} \).
\( \mathrm{AgBr} \rightarrow \mathrm{Ag}^{+}+\mathrm{Br} \)
Q:
1. (UFJF) Um estudante recolheu 1 litro de soluçāo saturada de sulfato de cobre e, após deixar o recipiente
por uma semana na temperatura ambiente, verificou a presença de cristais de sulfalo de cobre e um volume
de soluçāo final de 700 mL . Sabendo-se que a solubilidade do sulfato de cobre é de 22.3 g em 100 mL de água,
nessa temperatura, qual a massa (em gramas) de sulfato de cobre precipitada?
Q:
7 - A solubilidade do hidroxido de ferro II, em agua, e o,44g por litro de agua a \( 25^{\circ} \mathrm{C} \). A massa, em grema
dessa substancia, que se pode dissolver em 500 mL de agua, nessa temperatura, e:
\( \begin{array}{llll}\text { a) } 0,90 \mathrm{~g} & \text { b) } 0,56 \mathrm{~g} & \text { c) } 0,44 \mathrm{~g} & \text { d) } 0,36 \mathrm{~g} .\end{array} \)
Q:
- Adicionando-se soluto a um solvente. chega-se a um ponto em que o solvente nâo
lissolvor o soluto. Neste ponto a solucăo torna-se:
Q:
06. A Solubilidade do \( \mathrm{BaSO}_{4} \) em água a
\( 25^{\circ} . \mathrm{C} \) é igual a \( 4,0 \times 10^{-5} \mathrm{M} \). Calcule o
seu Kps.
BaSO, \( \rightarrow \mathrm{Ba}^{-2}+\mathrm{SO}_{4}^{2} \)
Q:
iv). What is the reason why the mixture was heated gently? (1 mark)
Q:
11. Što čini struju u vodljivim tekućinama? Objasni.
Q:
a) Describe how one can determine if the bridging oxygen in an ester is from an a
Icohol or from the carboxylic acid.
\( \mathrm{ks}) \)
b) Explain why amides are weaker bases than amines.
ks )
c) Draw the enol-keto forms of propanone
d) Explain why \( \mathrm{CH}_{3} \mathrm{COOH} \) has a lower Ka than \( \mathrm{CH}_{2} \mathrm{ClCOOH} \quad \) (2marks)
Q:
d) During the preparation of ethene gas in the laboratory, a mixture of ethanol and
concentrated sulphuric acid was heated gently and an oily liquid X and water were
formed. When the mixture was heated to \( 170^{\circ} \mathrm{C} \), a steady steam of ethene gas was
produced. During this process, the flask was kept cool.
i). Write the equation for the reaction between ethanol and concentrated sulphuric
acid. \( (2 \) marks)
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