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Talja [164]
3 years ago
14

To make a saturated solution, 30 g of sodium chloride is dissolved in 100 g of

Chemistry
1 answer:
lara31 [8.8K]3 years ago
5 0

Answer:

30%

Explanation:

As the formula for finding concentration

= (mass of solute/mass of solution)×100

= (30/100)×100

= 0.3×100

= 30%

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The presence of a large population of _____________ indicates water depleted of oxygen and a high level of organic pollution.
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The presence of a large population of sludgeworms indicates water depleted of oxygen and a high level of organic pollution.

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6 0
1 year ago
Which of the following 0.300 M solutions would contain the highest concentration of potassium ions?
mojhsa [17]

Here is a list of 0.300 M solutions that you can consider to select which has the highest concetration of potassium ions:

Select one:

a. potassium oxide

b. potassium phosphate

c. potassium hydrogen carbonate

d. potassium hypochlorite

e. potassium iodide

Answer:

  • <em><u>Option b. potassium phosphate</u></em>

Explanation:

First, you must write the chemical formula of each one of the potasssium compounds. Then, assume all the compounds ionize 100%.

Since all the solutions have the same concentrations, by assuming 100% ionization, the ionization equations will show which one produces the highest number of <em>potassium ions</em>, K⁺¹, and that is the solution with the highest concentration of such ions.

<u>1. Chemical formulae</u>

Compound                                              Formula

a. <em>potassium oxide         </em>                          K₂O                                

b. <em>potassium phosphate</em>                          K₃PO₄    

c. <em>potassium hydrogen carbonate</em>          KHPO₃

d. <em>potassium hypochlorite  </em>                     KClO₄

e. <em>potassium iodide     </em>                             KI

<u>2. Dissociation (ionization):</u>

  • a. <em>potassium oxide</em>, K₂O

           K₂O does not dissociate but react with water to product KOH, then KOH dissociates, but there is not such thing as a 0.300 M solution of K₂O.

  • b. <em>potassium phosphate</em>:

       K₃PO₄ → 3K³⁺ + PO₄¹⁻                3 K⁺¹ ions per unit formula

  • c. <em>potassium hydrogen carbonate</em>          

       KHPO₃ →  K⁺¹ + HPO₃⁻¹               1 K⁺¹ ion per unit formula

  • d. <em>potassium hypochlorite </em>                      

        KClO₄ → K⁺¹ + HClO₄⁻¹                1 K⁺¹  ion per unit formula

  • e.<em> potassium iodide</em>                                  

          KI → K⁺¹ + I⁻¹                                1 K⁺¹ ion per unit formula.

Hence, the 0.300 M solution of potasssium phosphate produces the highest concentration of potassium ions.

6 0
3 years ago
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GenaCL600 [577]
<h3><u>Answer</u>;</h3>
  • Halogens
  • Alkali metals
<h3><u>Explanation</u>;</h3>
  • Elements in the periodic table are classified into various categories including alkali metals, alkaline-earth metals, halogens, and noble gases among others.
  • <u>Alkali metals are Group 1 elements in the periodic table.</u> They comprise of elements lithium (Li) through francium (Fr). They have similar characteristics and behavior.
  • <u>Halogens is another category of elements which is a subset of the nonmetals.</u> They comprise group 17 of the periodic table, from fluorine (F) through Astatine (At). These elements are chemically reactive and reacts with other elements such as group 1 and group 2 element.
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3 years ago
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