What is the equation to determine the MA of a wedge?

An old antacid commercial claimed that each tablet of their product could neutralize 47 times its mass in stomach acid. The acti

butalik [34]

Answer : The number of moles of HCl neutralize is, 0.00824 moles.

Explanation :

The given balanced chemical reaction is:

$NaAl(OH)_2CO_3+4HCl\rightarrow NaCl+AlCl_3+3H_2O+CO_2$

First we have to calculate the moles of $NaAl(OH)_2CO_3$

$\text{Moles of }NaAl(OH)_2CO_3=\frac{\text{Mass of }NaAl(OH)_2CO_3}{\text{Molar mass of }NaAl(OH)_2CO_3}$

Molar mass of $NaAl(OH)_2CO_3$ = 144 g/mol

$\text{Moles of }NaAl(OH)_2CO_3=\frac{0.296g}{144g/mol}=0.00206mol$

Now we have to calculate the moles of HCl.

From the balanced chemical reaction we conclude that,

As, 1 mole of $NaAl(OH)_2CO_3$ react with 4 moles of HCl

So, 0.00206 mole of $NaAl(OH)_2CO_3$ react with $0.00206\times 4=0.00824$ moles of HCl

Thus, the number of moles of HCl neutralize is, 0.00824 moles.

8 0

3 years ago

A 18.08-g sample of the ionic compound , where is the anion of a weak acid, was dissolved in enough water to make 116.0 mL of so

Oksi-84 [34.3K]

Answer:

a) 129.14 g/mol

b) 8.87

Explanation:

Given that:

mass of the ionic compound [NaA] = 18.08 g

Volume of water = 116.0 mL = 0.116 L

Let the mole of the acid HCl = 0.140 M

Volume of the acid = 500.0 mL = 0.500 L

pH = 4.63

$V_{equivalence}_{acid}$ = 1.00 L

Equation for the reaction can be represented as:

$NaA_{(aq)} + HCl_{(aq)} -----> HA_{(aq)} + NaCl_{(aq)$

From above; 1 mole of an ionic compound reacts with 1 mole of an acid to reach equivalence point = 0.140 M × 1.00 L

= 0.140 mol

Thus, 0.140 mol of HCl neutralize 0.140 mol of ionic compound at equilibrium

Thus, the molar mass of the sample = $\frac{18.08g}{0.140 mole}$

= 129.14 g/mol

b) since pH = pKa

Then pKa of HA = 4.63

Ka = $10^{-4.63]$

= $2.3*10^{-5}$

$[A^-]equ = \frac{0.140M*1.00L}{1.00L+0.116L}$

$= \frac{0.140 mol}{1.116 L}$

= 0.1255 M

$K_a$ of HA = $2.3*10^{-5}$

$K_b = \frac{1.0*10^{-14}}{2.3*10^{-5}}$

$= 4.35*10^{-10}$

$A_{(aq)}$ + $H_2O_{(l)}$ $\rightleftharpoons$ $HA_{(aq)}$ + $OH^-_{(aq)}$

Initial 0.1255 0 0

Change - x + x + x

Equilibrium 0.1255 - x x x

$K_b = \frac{[HA][OH^-]}{[A^-]}$

$4.35*10^{-10} = \frac{[x][x]}{[0.1255-x]}$

As $K_b$ is very small, (o.1255 - x) = 0.1255

$x = \sqrt{0.1255*4.35*10^{-10}}$

[OH⁻] = $x = 7.4 *10^{-6}$

But pOH = - log [OH⁻]

= - log [ $7.4*10^{-6}$ ]

= 5.13

pH = 14.00 = 5.13

pH = 8.87

6 0

3 years ago

if a tiny marble has a radius of 0.25mm how many marbles can be lined up across the circumference of the earth, distance of 2490

horsena [70]

Answer : The number of marbles lined up across the circumference of the earth can be, $8.013\times 10^{10}$ marbles

Explanation :

First we have to calculate the diameter of tiny marble.

$Diameter=2\times Radius$

r = radius of marble = 0.25 mm

$Diameter=2\times (0.25mm)=0.50mm$

Now we have to calculate the number of marbles can be lined up across the circumference of the earth.

Given:

Circumference of the earth distance = $24900mile=4.00641\times 10^{10}mm$

conversion used: $1mile=1.609\times 10^6mm$

Number of marbles can be lined up = $\frac{4.00641\times 10^{10}mm}{0.50mm}=8.013\times 10^{10}$ marbles

Thus, the number of marbles lined up across the circumference of the earth can be, $8.013\times 10^{10}$ marbles

3 0

4 years ago

Magnesium, the element, is produced commercially by electrolysis from a molten salt (the "electrolyte") using a cell similar to

kirill115 [55]

Answer:

The half-reaction that occurs on the anode of an electrolytic cell is called oxidation.

This can easily be depicted by a chemical reaction as such "Zn(s) = Zn2+ (aq) + (2e-)"

While, the Zinc in this reaction loses two elections. Hence copper gains those electrons and becomes solid.

These reactions occurring on the anode are called positive reactions.

While the reaction that occurs on the cathode is called reduction. This reaction can be represented by this equation "Cu2+ (aq) + 2e- = Cu(s)".

These non-spontaneous reactions occurring in an electrolytic cell together are called redox reactions. These generate electrical energy.

7 0

3 years ago

Employers may not fire or other wise discriminate against an employee who does which of the following

Likurg_2 [28]

Answer:

race, religion, sex, if they are 40 or older, have a disability, pregnancy/childbirth. hope that helped

6 0

3 years ago