CAUSE AND EFFECT
Cause and
effect of precipitation
Expressions Cause and Effect
We can divide the most common linking words and
expressions of cause & effect into four
group:
1. Coordinating Conjunctions: for (cause), so (effect)
2. Subordinating Conjunctions: because, since, if, whenever, so that, as (cause)
3. Conjunctive Adverbs: therefore, for this reason, as a result, thus, that is why,
consequently (effect)
4. Preposition: because
of, reasons for, consequences of, due to (cause)
Because that is
the thing that becomes the occurrence of something happens while the result is
something that is the end or result of an event (deed or decision), the
requirements or the condition that precedes it.
Precipitation
is the process of forming a precipitate ie a solid that is otherwise insoluble
in water even though the precipitate actually has the slightest solubility.
Reaction in Solution- Most of the chemical reactions take place in solution.
The reaction in a solution is classified as a precipitation reaction if one of
the reaction products is insoluble in water.
Nadia :
assalamualaikum, Rini.
Rini :
wa'alaikum salam, nadia.
Nadia : rin, when is a solution said or classified as a settling reaction?
Rini : a reaction is said to be classified as a precipitation reaction if one of a product the reaction is not soluble in water. Examples of substances that are not soluble in water, CaCO3 and BaCO3.
Nadia : what will happen if calcium chloride is reacted with sodium phosphate?
Rini : to know the solubility of a substance in need of empiric know ledge as a result measurement of various substances in reaction. The reaction is:
3CaCl2 + 2Na3PO4 → Ca3 (PO4) 2 + 6NaCl
NaCl will dissolve in water, while Ca3 (PO4) 2 is insoluble. Phosphate compounds most of it is soluble in water, except phosphate compounds of sodium, potassium and ammonium. Therefore, the equation of the reaction can be written:
3CaCl2 (aq) + 2Na3PO4 (aq) → Ca3 (PO4) 2 (s) + 6NaCl (aq)
The net ionic equation of the reaction can be written:
3Ca2 + (aq) + 2PO43- (aq) → Ca3 (PO4) 2 (s)
In the reaction there is endapat on the reaction result that is: Ca3 (PO4) 2 (s).
Nadia : means the reaction result of calcium chloride and sodium phosphate produces the precipitate is:
Ca3 (PO4) 2 (s).
Rini : yes, right.
Nadia : Thanks for the answer.
Rini : Equally, hopefully useful.
why can not CaCO3 dan BaCO3 be soluble in water ?
BalasHapusbecause Water containing a lot of CO2 gas when it comes to limestone so CaCO3 will dissolve in the form of bicarbonate acid CaH2 (CO3) 2 which is an unstable compound (stable). Due to the influence of several factors such as temperature, air etc., the CO2 gas in the solution will come out causing the change of bicarbonic acid to a more difficult form of soluble, ie the original form of CaCO3.Barium chloride can be prepared from barium hydroxide [Ba (OH) 2] or barium carbonate [BaCO3], with barium carbonate found naturally as a mineral witherite. Barium chloride may also be prepared by reacting hydrochloric acid (HCl) with barium carbonate [BaCO3] or sulphide [BaSO4]. On an industrial scale, there are two steps to making BaCl2 derived from barite mineral (barium sulfate.
HapusWhat factors influence a precipitated substance?
BalasHapusFactors Affecting Precipitation
HapusA) Temperature
Solubility increases with rising temperatures, so with cheap temperatures the formation of the precipitate will decrease the amount of sediment in the solution.
B) Natural Properties of Solvents
Inorganic salts readily dissolve in air with organic solvents such as alcohols or acetic acids. The difference in solubility of a substance in an organic solvent can be used to separate the intermediates of two substances. Each solvent has a different capacity to dissolve a substance, as well as a soluble substance Bebeda on a particular solvent.
C) The Influence of Similar Ions
The solubility solubility will be reduced if dissolved in a solution containing similar ions in the air only.
D) Effect of pH
Soluble salt solubility containing anions of weak acids by pH, this is due to the incorporation of protons with their sediment anions. For example, the sediment of AgI will be increasingly dissolved with the increase of pH caused by H + will join I-led HI
E) Effect of Hydrolysis
If the salt of the weak acid is dissolved in the air there will be a change in the concentration of H + where this will cause the corresponding hydrolysis salt cation and this will increase the salt solubility.
F) Influence of Complex Ion
Solubility of insoluble salts will increase with the formation of complexes between the ligands and the salt cations. For example, AgCl will increase its solubility if NH3 solution is added, this is due to the formation of complex Ag (NH3) 2Cl.
hai nadia, can ou explain about you post? with your language and simple please
BalasHapusa reaction is said to be classified as a precipitation reaction if one of a product the reaction is not soluble in water. Examples of substances that are not soluble in water, CaCO3 and BaCO3.
Hapusto know the solubility of a substance in need of empiric know ledge as a result measurement of various substances in reaction. The reaction is:
3CaCl2 + 2Na3PO4 → Ca3 (PO4) 2 + 6NaCl
NaCl will dissolve in water, while Ca3 (PO4) 2 is insoluble. Phosphate compounds most of it is soluble in water, except phosphate compounds of sodium, potassium and ammonium. Therefore, the equation of the reaction can be written:
3CaCl2 (aq) + 2Na3PO4 (aq) → Ca3 (PO4) 2 (s) + 6NaCl (aq)
The net ionic equation of the reaction can be written:
3Ca2 + (aq) + 2PO43- (aq) → Ca3 (PO4) 2 (s)
In the reaction there is endapat on the reaction result that is: Ca3 (PO4) 2 (s).
Nadia : means the reaction result of calcium chloride and sodium phosphate produces the precipitate is:
Ca3 (PO4) 2 (s).
Give an example other than the one in your article about the reactions that can be deposited
BalasHapusAn inorganic precipitate is usually a base, an acid or a salt thereof. The most commonly used bases are ammonia (ammonia gas solution in water), NaOH or KOH. The precipitate formed is a hydroxide which will turn into its oxide when the first form is allowed. The use of a precipitator is always excessive in order to obtain a perfect precipitation but it may happen that the precipitated hydroxide will initially dissolve in an over-settling base. For example, the precipitated Cu (OH) 2 is soluble in NH4OH so that the latter can not be used as a precipitator to obtain Cu (OH) 2 precipitate. The proper reagent is NaOH. In contrast the Al (OH) 3 deposit will dissolve in a strong base, NaOH or KOH. The Zn (OH) 2 precipitate will dissolve in the weak base (NH4OH) or strong base (NaOH / KOH), so the zinc compound should be precipitated with a salt eg (NH4) 2HPO4. The barium compound can be precipitated with H2SO4 to form a precipitate of BaSO4. Precipitation of BaSO4 can be done by using Na2SO4 (salt) instead of sulfuric acid. The silver chloride precipitate is also formed when the NaCl settler is added to a silver salt solution.
BalasHapusIn general, the hydroxide-shaped sediment decomposes when permitted at high temperatures to form the oxide which is then weighed (fixed weight). Sludges such as BaSO4 are relatively difficult to decompose at high temperatures but will be reduced if there are reducing agents such as C or H 2. Reducing C is obtained in the filter paper used as a filter.
A number of metal ions can be deposited with organic reagents. Organic substances such as ¥ - hydroxy - quinoline [¥ - quinolinoline or oxine (oxina)] form compounds that precipitate with metal ions such as aluminum, iron, zinc, copper, zirconium and so on. This substance is almost insoluble in water and when used as a settler it must be dissolved in a particular organic solvent such as acetic acid or methanol.
The oxide formula: C9H7OH