Table of Contents
- 1 What is the name for Ca2 +?
- 2 What is the formula for Ca2+ and O2?
- 3 What is the formula of compound containing K+ and O2 − ions?
- 4 What is the name of pb2+?
- 5 What is the best name of the ion Pb2+?
- 6 Is lead 2 hydroxide soluble?
- 7 How do you test for Pb2+?
- 8 Which anion will form a precipitate with Al3 +?
- 9 Why is the ion of lead found in both groups I and II?
- 10 Why is NH4Cl added before NH4OH?
- 11 What are the eight sulfides of Group II cations?
- 12 Which cation lies in both first and second group?
- 13 What is the group reagent of 2nd group of basic radical?
- 14 How do you classify anions and cations?
- 15 What is the group reagent of Group 2?
- 16 What is the group identification test for Group 3?
- 17 What is the group reagent of zero group?
- 18 What is meant by group reagent?
- 19 Why anions are called acid radicals?
- 20 What is the function of ammonium chloride used in the Group 3 precipitating reagent?
- 21 How do you test for cations?
- 22 Which of the following is fifth group reagent?
- 23 Why is ammonia in zero group?
What is the name for Ca2 +?
What is the formula for Ca2+ and O2?
“Names and Formulas of Inorganic Compounds”
|formula of Ca2+ and O2-||CaO|
|formula of Ca2+ and P3-||Ca3P2|
|name of Ca3P2||calcium phosphide|
|name of CaO||calcium oxide|
What is the formula of compound containing K+ and O2 − ions?
1 Answer. Potassium oxyde, K2O .
What is the name of pb2+?
What is the best name of the ion Pb2+?
Please visit the Lead element page for information specific to the chemical element of the periodic table….Lead(2+) ion.
|Structure||Find Similar Structures|
|Synonyms||Lead(2+) Lead(2+) ion Lead (II) ion Pb2+ 3 More…|
Is lead 2 hydroxide soluble?
Lead(II) hydroxide, Pb(OH)2, is a hydroxide of lead, with lead in oxidation state +2….Lead(II) hydroxide.
|Solubility in water||0.0155 g/100 mL (3000 °C)|
|Solubility product (Ksp)||1.42 x 10−20|
|Solubility||soluble in dilute acid and alkalis; readily soluble in acetone , nitric acid and acetic acid|
How do you test for Pb2+?
Tests for Cations Note that Al3+ and Pb2+ can be distinguished by adding aqueous potassium iodide (KI). If Pb2+ is present, a bright yellow precipitate of lead (II) iodide (PbI2 ) will be formed. H+ (acid) can be identified by adding carbonate. Carbon dioxide gas will be produced.
Which anion will form a precipitate with Al3 +?
Answer is: sulfate anion. Balanced chemical reaction: Ca²⁺(aq) + SO₄²⁻(aq) → CaSO₄(s) . Calcium sulfate (CaSO₄) has very low solubility in water (Ksp for calcium sulfate is 2.36·10⁻⁴).
Why is the ion of lead found in both groups I and II?
Lead has been placed in group 1st and 2nd because lead chloride is slightly soluble in water and therefore, lead is never completely precipitated by adding dilute HCl to a sample; the rest of the lead ions are precipitated with H2S in acidic medium.
Why is NH4Cl added before NH4OH?
In salt analysis NH4Cl is added in sufficient amount before adding NH4OH because otherwise the cations of higher group may get precipitated in group III. This is because NH4Cl is strong electrolyte and decomposes completely. The NH4OH however is a weak base and does not ionize completely.
What are the eight sulfides of Group II cations?
Group II (Cu2+, Bi3+, Cd2+, Hg2+, As3+, Sb3+, Sn4+) cations produce very insoluble sulfides (Ksp values less than 10-30) so they can be precipitated by low amounts of sulfide ion; this can be achieved by adding an acidic solution of H2S.
Which cation lies in both first and second group?
Well, I found that lead cation Pb2+ is present in both group 1 and group 2 of cation analysis.
What is the group reagent of 2nd group of basic radical?
|Group||Basic radicals||Group reagent|
|I||Ag+,Hg2+2(I) , Pb2+||Dil. HCl|
|II||Cu2+, Cd2+, Pb2+, Hg2+ (II), Bi3+, As3+, Sb3+, Sn2+||H2S gas in presence of dil. HCl|
|III||Al3+, Cr3+, Fe3+||NH4OH in presence of NH4Cl|
|IV||Zn2+, Ni2+, Mn2+, Co2+||H2S in ammonical medium|
How do you classify anions and cations?
- The electronic configuration of many ions is that of the closest noble gas to them in the periodic table.
- An anion is an ion that has gained one or more electrons, acquiring a negative charge.
- A cation is an ion that has lost one or more electrons, gaining a positive charge.
What is the group reagent of Group 2?
concentrated sulphuric acid
What is the group identification test for Group 3?
Part 1 Test for Cr (III): acidify with dilute acetic acid CH3COOH and add 0.25M lead acetate Pb(CH3COO)2 solution, a yellow precipitate of lead chromate is formed. This yellow precipitate is soluble in sodium hydroxide solution. it conforms the presence of Cr(III).
What is the group reagent of zero group?
Salt Analysis of Cations and Anions
|Zero Group||O.S. + NaOH + Heat||NH4+|
|I Group||O.S. + HCl||Pb2+|
|II Group||O.S. + HCI + H2S||Cu2+|
|III Group||O.S. +NH4Cl + NH4OH||AI2+ ,Fe3+|
What is meant by group reagent?
The “Group reagent” is a cocktail of reagents that serves as a prima facie indication of a particular cation, characterized by the formation of a precipitate during a positive test/result and no precipitation in the event of a negative test/result.
Why anions are called acid radicals?
Cation and anion are called basic and acidic radicals, respectively, because during salt formation cation comes from base and anion comes from acid.
What is the function of ammonium chloride used in the Group 3 precipitating reagent?
NH4Cl has a threefold function: 1) By acting as a common ion in the equilibrium of NH3, it reduces the concentration of OH- ions, thus preventing the precipitation of undesirable hydroxides, such as Mg(OH)2 .
How do you test for cations?
There are two types of tests used in chemistry to test for cations.
- Flame Test. . The Flame test involves exposing the compound to a flame and identifying the compound by the flame color produced.
- Sodium Hydroxide Test. .
Which of the following is fifth group reagent?
Ammonium sulphide is used for testing 5th group cations.
Why is ammonia in zero group?
Also, the compound of ammonium have very high solubility product. Therefore, they are given special attention, and a place in group zero.