All categories

4 years ago

Why do group 1 cations form precipitates when mixed with hcl?

1 answer:

8 0

Both of you are overlooking a pretty big component of the question...the Group I cation isn't being dissociated into water. We're testing the solubility of the cation when mixed with HCl. And this IS a legitimate question, seeing as our lab manual is the one asking.

By the way, the answer you're looking for is "Because Group I cations have insoluble chlorides". 

"In order...to distinguish cation Group I, one adds HCl to a sample. If a Group I cation is present in the sample, a precipitate will form."

You might be interested in

acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor How many grams of water are produced by the sa

ella [17]

Answer: The amount of water produced in the given reaction is $0.692x$ grams.

Explanation:

Let us assume that the initial amount of acetylene gas given be 'x' grams. Now, to calculate the number of moles, we will use the formula:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ....(1)

Given mass of acetylene = x grams

Molar mass of acetylene = 26 g/mol

Putting values in above equation, we get:

$\text{Number of moles of acetylene}=\frac{xg}{26g/mol}=\frac{x}{26}mol$

The reaction of combustion of acetylene is given by the equation:

$2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O$

By Stoichiometry of the reaction:

2 moles of acetylene produces 2 moles of water.

So, $\frac{x}{26}$ moles of acetylene will produce = $\frac{2}{2}\times \frac{x}{26}=\frac{x}{26}$ moles of water.

Now, to calculate the amount of water produced, we use equation 1:

Molar mass of water = 18 g/mol

Moles of water = $\frac{x}{26}mol$

Putting values in equation 1, we get:

$\frac{x}{26}mol=\frac{\text{Mass of water}}{18g/mol}$

$\text{Mass of water}=\frac{x}{26}\times 18=0.692x$ grams

8 0

3 years ago

What natural resources are used to make chloroquine?

Nitella [24]

In areas where resistance is present, otherantimalarials, such as mefloquine or atovaquone, may be used instead. The Centers for Disease Control and Prevention recommend against treatment of malaria with chloroquine alone due to more effective combinations.

7 0

4 years ago

3. Description of which organelle betul "Creates a physical barrier ;

Ghella [55]

The cell membrane performs those functions. It is the outer layer of a cell and it creates a barrier, regulates material entry and exit, uses chemical signals, and creates structure.

4 0

3 years ago

Imagine riding in a car or bus. Describe four uses of petrochemical products that are related to the manufacture or use of motor

Leya [2.2K]

Tyres (or tires, as spelt in the USA).
Foam cushioning in the seats.
Paintwork.
Oil in the engine - to simply make the bus / car work!
All and every plastic part

3 0

3 years ago

Been sick please help with all. missed to much class

DENIUS [597]

I can't see the picture properly so can you make zoomed in pictures for me?

7 0

4 years ago