All categories

3 years ago

Calculate the concentration of all ions present in 5.96 g Na2S in 1.00 L of solution.

Chemistry

1 answer:

aksik [14]3 years ago

6 0

Answer:

[Na+] = 0.1528 M

[S^2-] = 0.0764 M

Explanation:

Step 1: Data given

MAss of Na2S = 5.96 grams

Volume of solution = 1.00 L

Molar mass Na2S = 78.045 g/mol

Step 2: Calculate moles Na2S

Moles Na2S = Mass Na2S / molar mass Na2S

Moles Na2S = 5.96 grams / 78.045 g/mol

Moles Na2S = 0.0764 moles

Step 3: Calculate moles ions

For 1 mol Na2S we have 2 moles Na+ and 1 mol S^2-

For 0.0764 moles Na2S we have 0.0764 moles S^2- and 2*0.0764 = 0.1528 moles Na+

Step 4: Calculate concentration of ions

[Na+] = 0.1528 moles / 1 L = 0.1528 M

[S^2-] = 0.0764 moles / 1L = 0.0764 M

You might be interested in

Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an el

givi [52]

Answer: The amount of time needed to plate 14.0 kg of copper onto the cathode is 295 hours

Explanation:

We are given:

Moles of electron = 1 mole

According to mole concept:

1 mole of an atom contains $6.022\times 10^{23}$ number of particles.

We know that:

Charge on 1 electron = $1.6\times 10^{-19}C$

Charge on 1 mole of electrons = $1.6\times 10^{-19}\times 6.022\times 10^{23}=96500C$

$Cu^{2+}+2e^-\rightarrow Cu$

$2\times 96500=193000C$ is passed to deposit = 1 mole of copper

63.5 g of copper is deposited by = 193000 C

$14\times 1000g=14000g$ of copper is deposited by = $\frac{193000}{63.5}\times 14000=42551181 C$

To calculate the time required, we use the equation:

$I=\frac{q}{t}$

where,

I = current passed = 40.0 A

q = total charge = 42551181 C

t = time required = ?

Putting values in above equation, we get:

$40.0=\frac{42551181 C}{t}\\\\t=1063779sec$

Converting this into hours, we use the conversion factor:

1 hr = 3600 seconds

So, $1063779s\times \frac{1hr}{3600s}=295hr$

Hence, the amount of time needed to plate 14.0 kg of copper onto the cathode is 295 hours

3 0

4 years ago

The lowest whole-number ratio of elements in a compound is called the ?

ASHA 777 [7]

Answer:

The Empirical Formula.

Explanation:

From the empirical formula and using the weight (in g) of a given substance, we can come up with the molecular formula which is the actual weight of a substance. Sometimes, we find that the empircal formula is the molecular formula.

8 0

3 years ago

Pyridine rings can also under electrophilic aromatic substitution. given 2-methoxypyridine below, draw the expected major produc

notka56 [123]

Co2 is correct buddy

8 0

4 years ago

. Why a chlorine atom with an atomic number of 17 will be negatively charged when its valance shell gains an electron.

sesenic [268]

Explanation:

When chlorine bonds and becomes stable, (had a full outer electron shell), because we know that chlorine has 7 electrons in it’s outer shell, it requires 1 to gain noble gas structure. So, when if bonds with an element and then becomes stable, the gaining of an electron means it becomes a negatively charged ion. (an ion being a charged particle.)

3 0

3 years ago

A Rolaids tablet contains calcium for neutralizing stomach acid. if a Rolaids tablet neutralizes 24.65ml of 0.547m hydrochloric

Lelu [443]

There are 674 mg of calcium carbonate in a Rolaids tablet

<h3>Further explanation</h3>

Reaction

CaCO₃ + 2HCl ⇒ CaCl₂ + CO₂ +H₂O

V HCl = 24.65 ml

M HCl = 0.547

mol HCl :

$\tt 24.65\times 0.547=13.48~mlmol$