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IgorC [24]
3 years ago
5

How much sugar will dissolve in 1000 g of water at 80°c?

Chemistry
1 answer:
Brilliant_brown [7]3 years ago
5 0
If we look at the sugar-water phase diagram;
at 80° C : 26% of water will dissolve 74% of sugar
C =  m / ( m + 1000 g ) · 100
74 = m / ( m + 1000 g ) · 100
0.74 = m / ( m + 1000 g )
m = 0.74 · ( m + 1000 g )
m = 0.74 m + 740 g
m - 0.74 m = 740 g
0.26 m = 740 g
m = 740 g : 0.26
m = 2,846.15 g ≈ 2,846 g
Answer:
m ( sugar ) = 2,846 g. 
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2.In a titration, 25.00 cm3 of a solution of hydrochloric acid reacted with 18.40 cm3 of sodium hydroxide solution of concentrat
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Answer:

0.11mol/dm³

Explanation:

The reaction expression is given as:

             HCl   +  NaOH  →  NaCl + H₂O

Volume of acid  = 25cm³  = 0.025dm³

Volume of base  = 18.4cm³ = 0.0184dm³

Concentration of base  = 0.15mol/dm³

Solution:

The concentration of hydrochloric acid = ?

 To solve this problem, let us first find the number of moles of the base;

 Number of moles  = concentration x volume

 Number of moles  = 0.15mol/dm³ x 0.0184dm³  = 0.00276mol

From the balanced reaction equation;

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Therefore,  0.00276mol of the base will combine with  0.00276mol of HCl

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The concentration of hydroxide ions is greater than the concentration of hydronium ions for acidic solutions.
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Answer:

True

Explanation:

It's true because the pH is a measure of how basic or acid a solution is. In an acidic medium, the pH scales goes from 0 to 7. While in a basic medium goes from 7 to 14. The lower the pH value of the most acid the solution is.

1. The expression pH = -log(molar concentration of hydronium) allow to calculate the pH of a solution.

2. On the other hand, the expression pOH = -log(molar concentration of hydroxide) allow to determine the pOH of a solution.

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In this case the molar concentration of hydronium is 0,001M. And the molar concentration of hydroxide ions is just 0,00000000001M.

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