Chemistry, 11.07.2019 19:00, rainingsouls

You are presented with a white solid and told that due to careless labeling it is not clear if the substance is barium chloride, lead chloride, or zinc chloride. when you transfer the solid to a beaker and add water, the solid dissolves to give a clear solution. next a na2so4(aq) solution is added and a white precipitate forms. what is the identity of the unknown white solid?

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answered: shimmerandshine1

The given salts are Barium chloride, lead chloride and zinc chloride.

The balanced chemical reaction between barium chloride and sodium sulfate:

$BaCl_{2}(aq)+Na_{2}SO_{4}(aq)--2NaCl(aq)+BaSO_{4}(s)_{white precipitate}$

The balanced chemical reaction between lead chloride and sodium sulfate:

$PbCl_{2}(aq)+Na_{2}SO_{4}(aq)--2NaCl(aq)+PbSO_{4}(s)_{white precipitate}$

The balanced chemical reaction between zinc chloride and sodium sulfate:

$ZnCl_{2}(aq)+Na_{2}SO_{4}(aq)--2NaCl(aq)+ZnSO_{4}(aq)$

Both Barium chloride and lead chloride produce a white precipitate of their respective sulfates upon reaction with sodium sulfate. But BaCl2 is readily soluble in water where as Lead chloride is insoluble in water.

Therefore, the compound is barium chloride.

answered: bobby237065

Double displacement reaction is defined as the reaction in which two ionic compounds exchange their anions or cations to form precipitate, salt, or water. The compound barium chloride will form white solid precipitate known as barium sulphate.

The given compounds are barium sulphate, lead chloride, and zinc chloride. These compounds when react with sodium sulphate, will result in different types of products. The chemical reactions for the given compounds are as follows:

Reaction between barium chloride and sodium sulphate is:

BaCl

+ Na

$\rightarrow$ 2 NaCl + BaSO₄

The precipitate of barium sulphate is formed along with sodium chloride. The white precipitate settles done in the beaker, whereas sodium chloride remains dissolved in water.

Reaction between lead chloride and sodium sulphate is:

PbCl₂ + Na

$\rightarrow$ 2 NaCl + PbSO₄

The precipitate formed is also of white colour, known as lead sulphate. The sodium chloride is also formed in the reaction that remains dissolved in solution.

Reaction between zinc chloride and sodium sulfate:

ZnCl₂ + Na

$\rightarrow$ 2 NaCl + ZnSO₄

The compounds of zinc chloride and sodium sulfate formed in aqueous solution are sodium chloride and zinc sulfate.

Form the above equation, it is clear that barium chloride compound forms white precipitate that is dissolvable in the water. The white precipitate of lead sulphate is insoluble in the water.

Therefore, the identity of the white solid is barium sulphate.

To know more about precipitation, refer tot he following link:

link

answered: Guest

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

answered: Guest

Mass is the amount of matter in an object. weight is the measurement of the pull of gravity on an object. say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165) now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon. however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant. in conclusion it is possible for your weight to change as your mass remains constant.