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3 years ago

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What is variable????

2 answers:

emmasim [6.3K]3 years ago

7 0

Answer:

<h3>Variable are all the quantities that could change in an experiment.</h3>

Misha Larkins [42]3 years ago

4 0

Answer:

Basically, a variable is any factor that can be controlled, changed, or measured in an experiment. It's anything that can be changed in the experiment.

Explanation:

Scientific experiments have several types of variables. The independent and dependent variables are the ones usually plotted on a chart or graph, but there are other types of variables you may encounter. The presence/absence of the chemical is the independent variable. The health of the (ex:)rat (whether it lives and can reproduce) is the dependent variable.

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The copper(I) ion forms a chloride salt (CuCl) that has Ksp = 1.2 x 10-6. Copper(I) also forms a complex ion with Cl-:Cu+ (aq) +

Mnenie [13.5K]

Answer: (a) The solubility of CuCl in pure water is $1.1 \times 10^{-3} M$ .

(b) The solubility of CuCl in 0.1 M NaCl is $9.5 \times 10^{-3} M$ .

Explanation:

(a) Chemical equation for the given reaction in pure water is as follows.

$CuCl(s) \rightarrow Cu^{+}(aq) + Cl^{-}(aq)$

Initial: 0 0

Change: +x +x

Equilibm: x x

$K_{sp} = 1.2 \times 10^{-6}$

And, equilibrium expression is as follows.

$K_{sp} = [Cu^{+}][Cl^{-}]$

$1.2 \times 10^{-6} = x \times x$

x = $1.1 \times 10^{-3} M$

Hence, the solubility of CuCl in pure water is $1.1 \times 10^{-3} M$ .

(b) When NaCl is 0.1 M,

$CuCl(s) \rightarrow Cu^{+}(aq) + Cl^{-}(aq)$ , $K_{sp} = 1.2 \times 10^{-6}$

$Cu^{+}(aq) + 2Cl^{-}(aq) \rightleftharpoons CuCl_{2}(aq)$ , $K = 8.7 \times 10^{4}$

Net equation: $CuCl(s) + Cl^{-}(aq) \rightarrow CuCl_{2}(aq)$

$K' = K_{sp} \times K$

= 0.1044

So for, $CuCl(s) + Cl^{-}(aq) \rightarrow CuCl_{2}(aq)$

Initial: 0.1 0

Change: -x +x

Equilibm: 0.1 - x x

Now, the equilibrium expression is as follows.

K' = $\frac{CuCl_{2}}{Cl^{-}}$

0.1044 = $\frac{x}{0.1 - x}$

x = $9.5 \times 10^{-3} M$

Therefore, the solubility of CuCl in 0.1 M NaCl is $9.5 \times 10^{-3} M$ .

7 0

3 years ago

A student distills a sample of ink. Devise a simple method to show that the liquid collected is pure water. Include the expected

yulyashka [42]

Answer:

Distillation

Explanation:

Water vaporizes at lower temperature than the ink pigment so if you heat them, the water evaporates, leaving the ink pigment in the flask

4 0

3 years ago

Magnesium carbonate and sulphuric acid react to form

Mekhanik [1.2K]

Answer:

magnesium sulfate + water + carbon dioxide

Explanation:

4 0

2 years ago

Read 2 more answers

Someone explain what to do here…thanks.

umka21 [38]

Answer:

The answer is 900 000m.

This is because km is 3 times greater than a meter.

6 0

3 years ago

Common coagulants (salts) used in conventional water treatment include the following alum (aluminum sulfate), sodium aluminate,

vladimir2022 [97]

Answer:

True

Explanation:

This is the true statement .

Because There are two types of metal coagulants used : aluminium and iron.

The aluminum coagulants include aluminum sulfate, aluminum chloride and sodium aluminate.

The iron coagulants include ferric sulfate, ferrous sulfate, ferric chloride and ferric chloride sulfate.

7 0

3 years ago