Answer:
8.54
Explanation:
At equivalence point :
42.2 X 0.052 = Vol. NaOH X 0.0372
Vol of NaOH = 2.1944/0.0372 = 58.99 ml
So volume of NaOH recquired to reach equivalence point = 58.99 ml
Number of miliimoles of CH3COOH = molarity X volume in ml = 42.2 X 0.052 = 2.1944 millimoles
Number of millimoles of NaOH = 58.99 X 0.0372 = 2.1944
Now CH₃COOH and NaOH reacts to give CH₃COONa according to the reaction :
CH₃COOH + NaOH ------> CH₃COONa + H₂O
1 mole of CH₃COOH reacts with 1 mole of NaOH to give 1 mole of CH₃COONa
So 2.1944 millimoles of CH₃COOH will react with 2.1944 millimoles of NaOH to give 2.1944 millimoles of CH₃COONa
So all the acid (CH₃COOH) and base (NaOH) has been converted into salt (CH₃COONa) so there is no acid or base left.
Now molarity of CH₃COONa = number of millimoles of CH₃COONa/total volume in ml = 2.1944/(58.99 + 42.2) = 2.1944/101.19 = 0.02169 M
So using the hydrolysis equation :
pH = 1/2 [ pKw + pKa + log c ]
Ka for acetic acid = 1.75 X 10⁻⁵
so pKa = -log (1.75 X 10⁻⁵) = 4.74
Kw = 10⁻¹⁴
so pKw = -log 10⁻¹⁴ = 14
c = 0.02169
so log c = log 0.02169 = -1.66
putting the values....
pH = 1/2 [14 + 4.74 - 1.66 ]
pH = 1/2 [ 17.08] = 8.54
Answer:
The easiest way to separate a mixture of sugar and water is to use <em><u>distillation</u></em>, a process that separates substances based on their different boiling points. 《☆☆☆☆☆》
Explanation:
Hope it helps JOIN 《Æ §QŮÅĐ》
Hey there!:
Molar mass of Mg(OH)2 = 58.33 g/mol
number of moles Mg(OH)2 :
moles of Mg(OH)2 = 30.6 / 58.33 => 0.5246 moles
Molar mass of H3PO4 = 97.99 g/mol
number of moles H3PO4:
moles of Mg(OH)2 = 63.6 / 97.99 => 0.649 moles
Balanced chemical equation is:
3 Mg(OH)2 + 2 H3PO4 ---> Mg3(PO4)2 + 6 H2O
3 mol of Mg(OH)2 reacts with 2 mol of H3PO4 ,for 0.5246 moles of Mg(OH)2, 0.3498 moles of H3PO4 is required , but we have 0.649 moles of H3PO4, so, Mg(OH)2 is limiting reagent !
Now , we will use Mg(OH)2 in further calculation .
Molar mass of Mg3(PO4)2 = 262.87 g/mol
According to balanced equation :
mol of Mg3(PO4)2 formed = (1/3)* moles of Mg(OH)2
= (1/3)*0.5246
= 0.1749 moles of Mg3(PO4)2
use :
mass of Mg3(PO4)2 = number of mol * molar mass
= 0.1749 * 262.87
= 46 g of Mg3(PO4)2
Therefore:
% yield = actual mass * 100 / theoretical mass
% = 34.7 * 100 / 46
% = 3470 / 46
= 75.5%
Hope that helps!
An atom gains an electron from another atom. Hence, option B is the correct answer.
<h3>What is an atom?</h3>
An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.
When an atom shares electrons with another atom then it results in the formation of a covalent bond.
Whereas when an atom transfer electrons from one atom to another then it results in the formation of an ionic bond.
When the nucleus of an atom splits then it represents a nuclear fission reaction and energy is released during this process.
Hence, option B is the correct answer.
Learn more about the atom here:
brainly.com/question/1566330
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