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3 years ago

Analysis- How could you determine whether an unknown clear liquid is pure water or

Chemistry

1 answer:

mestny [16]3 years ago

4 0

Answer:

Boiling the subtance

Explanation:

To determine the nature of an unknown liquid the first thing you can do is boil it:

* If the sample is water, the boiling point must be near to 100°C

*When all pure water is evaporated, there is no residue, the glass must be empty.

* But if the sample is salt water, when all water is evaporated, you will see a solid white residue that, possibly, is salt.

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Which of the following ions will react with water in a hydrolysis reaction?Cu2+K+Ba2+Zn2+F-SO32-Cl-

Alik [6]

<h3><u>Answer</u>;</h3>

Cu2+, Zn2+, F-, and SO3^2-

<h3><u>Explanation</u>;</h3>

Hydrolysis is a reaction of a substance or a compound with water.
Anions such as Cl- and cations such as K+ and Ba2+ of strong acids and bases to not hydrolyze.
For example; KOH and Ba(OH)2 are strong bases, and HCl is a strong acid.
All the other ions will have a hydrolysis reaction with water and establish an equilibrium;

Cu2+ + HOH ↔ CuOH^+ + H+

Zn2+ + HOH ↔ZnOH^+ + H+

F- + HOH ↔ HF + OH-

SO3^2- + HOH ↔ HSO3^- + OH-

5 0

4 years ago

What is the pOH of a solution with [OH-] = 1.4 x 10-13?

lukranit [14]

Answer:

C. 12.85

Explanation:

just did

4 0

3 years ago

What is the volume of 84 g of bromine gas (Br2) at STP?

Alla [95]

Answer : The correct option is, 11.77 L

Solution : Given,

Mass of bromine gas = 84 g

Molar mass of bromine gas = 159.8 g/mole

First we have to calculate the moles of bromine gas.

$\text{Moles of }Br_2=\frac{\text{ given mass of }Br_2}{\text{ molar mass of }Br_2}=\frac{84g}{159.8g/mole}=0.5256moles$

Now we have to calculate the volume of bromine gas at STP.

As we know that at STP,

1 mole of bromine gas contains 22.4 L volume of bromine gas

So, 0.5256 mole of bromine gas contains $22.4\times 0.5256=11.77L$ volume of bromine gas

Therefore, the volume of bromine gas at STP is, 11.77 L

3 0

4 years ago

Read 2 more answers

For the following reactions, write a balanced equation using half-reactions and calculate the voltage to be expected.

Iteru [2.4K]

a) $2Na(s) +2H_2O(I)$ → $2Na^+(aq) + OH^-(aq)+ H_2(g)$

b) $2Ag (s) +2H^(aq)$ → $2 Ag^+ (aq) +H_2(g)$

<h3>What are half-reactions?</h3>

The half-reaction method is a way to balance redox reactions. It involves breaking the overall equation down into an oxidation part and a reduction part.

$2Na(s) +2H_2O(I)$ → $2Na^+(aq) + OH^-(aq)+ H_2(g)$

$E^0 cell = E^0 (reduction) - E^0 (oxidation)$

= $E^0(\frac{H_2O}{H_2}, OH^-) -E^0(Na^+/Na)$

= -0.83 - (-2.71) =1.88V

$2Ag (s) +2H^(aq)$ → $2 Ag^+ (aq) +H_2(g)$

$E^0cell$ = $E^0(H^+/H_2) -E^0(Ag^+/Ag)$

$E^0cell$ =-0. - (0.8) =-0.8V

Learn more about the half-reactions here:

https://brainly.in/question/18053421

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8 0

2 years ago

Lakes that have been acidified by acid rain can be neutralized by limiting the addition of limestone how much limestone is requi

svet-max [94.6K]

From the given pH, we calculate the concentration of H+:
[H+] = 10^-pH = 10^-5.5
We then use the volume to solve for the number of moles of H+:
moles H+ = 10^-5.5M * 4.3x10^9 L = 13598 moles
From the balanced equation of the neutralization of hydrogen ion by limestone written as
CaCO3(s) + 2H+(aq) → Ca2+(aq) + H2CO3(aq)
we use the mole ratio of limestone CaCO3 and H+ from their coefficients, which is 1 mole of CaCO3 is to react with 2 moles of H+, to compute for the mass of the limestone:
mass CaCO3 = 13598mol H+(1mol CaCO3/2mol H+)
(100.0869g CaCO3/1mol CaCO3)(1kg/1000g)
= 680 kg

4 0

3 years ago