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Anonymous users2024-02-05Analysis can be seen. 1) The precipitate must be Baso4 or BaCO3 (BaSo4 is generated by Na2SO4 and BaCl2).
2) It is possible to push out the precipitate not BaSO4 because BaSO4 2HNO3====Ba(NO3)2+H2SO4
But nitrates are melted in water, so the precipitate must be BAC33) sulfate only baso4 does not dissolve in water, then it must contain BA ions.
BaCO3 is used, and it reacts with dilute sulfuric acid with bubbles, and only BaCl2 is passed.
Therefore, the white powder must contain BaCO3, BaCl2, must not contain Na2SO4, and may contain NaNO3
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Anonymous users2024-02-04From (1), it is known that the white solid must be barium carbonate or barium sulfate.
It is known from (2) that the white solid is barium carbonate, because barium sulfate is insoluble in dilute nitric acid.
From (3) it is known that the white precipitate is barium sulfate.
The solid must contain barium carbonate and barium chloride, and must not contain sodium sulfate, and may contain sodium nitrate.
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Anonymous users2024-02-03Put a small amount of white powder into the component water, stir it thoroughly, let it stand, and filter it to obtain white solid and filtrate. There must be ba-ions.
Dilute nitric acid is added to the resulting solid, and the solid is completely dissolved without SO4 ions.
Nitrate is fully soluble.
Therefore, there must be bacl2 and baco3
Must be Na2SO4 free, may have Nano3
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Anonymous users2024-02-02The reaction between acid-base salts and acids is called metathesis reaction, and the process: acid + salt new salt + new acid.
Strong acids become weak acids, and the salts here can be insoluble salts. Metathesis reaction occurs with alkali, alkali soluble + salt soluble neoalkali + new salt.
Substitution reaction with some metals: salt + metal element new metal element + new salt, the metal in the reaction must be more active than the metal in the salt before it can be replaced.
The chemical properties of acid-base salts are neutral and uncharged ionic compounds composed of cations, positively charged ions, and anions, negatively charged ions.
Acid refers to compounds in which all cations produced during ionization are hydrogen ions; Base refers to a compound in which all the anions produced during ionization are hydroxide ions. It can be abbreviated as: hydrogen head acid, hydroxide end alkali, metal start acid end is salt.
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Anonymous users2024-02-011. Acid.
Acid + base – salt + water.
Acid + salt--- new acid + new salt.
Metal oxide + acid --salt + water.
Metal + Acid - Salt + Hydrogen.
Litmus turns red when exposed to acid, and phenolphthalein does not change color when exposed to acid.
2. Alkali. Non-metallic oxides + alkali --salt + water alkali + salt --neoalkali + new salt.
Litmus turns blue when exposed to alkali, and phenolphthalein turns red when exposed to alkali.
Alkali + acid--- salt + water.
3. Salt metal + salt - new metal + new salt.
Salt + Salt – Two new salts.
Salt + acid--- new salt + new acid.
Salt + alkali --- new salt + new alkali.
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Anonymous users2024-01-31Acids and bases produce water and salts. Acids and metal compounds form water. Acids and metals produce hydrogen.
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Anonymous users2024-01-30Acid + base – salt + water.
Condition: Unconditional.
Acid + salt--- new acid + new salt.
Conditions: Precipitation, gas, and water are generated in the product.
Metal oxide + acid --salt + water.
Condition: Unconditional.
Metal + Acid - Salt + Hydrogen.
Conditions: Acid does not use concentrated sulfuric acid, concentrated nitric acid; Potassium, calcium and sodium are not used before hydrogen is used for metals.
Litmus turns red when exposed to acid, and phenolphthalein does not change color when exposed to acid.
2. Chemical properties of alkali.
Non-metallic oxides + alkalis --salts + water.
Conditions: Acid anhydrides such as CO2, SO2, SO3, etc., can react with bases.
Alkali + Salt -- Neoalkali + Neosalt.
Conditions: alkali salt and salt salt, pre-dissolution and post-precipitation.
Litmus turns blue when exposed to alkali, and phenolphthalein turns red when exposed to alkali.
3. Chemical properties of salt.
Metal + Salt – New Metal + New Salt.
Conditions: After the pre-change, the salt is soluble.
Salt + Salt – Two new salts.
Conditions: alkali salt and salt salt, pre-dissolution and post-precipitation.
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Anonymous users2024-01-29Acids are H+ (hydrogen ions) plus acid ions.
Alkali is a metal ion plus (OH-) hydroxide ion.
Salts are ammonium ions or metal cations plus acid anions.
For example, Hno3 is composed of hydrogen ions and acid ions, which is an acid;
H2SO4 is composed of hydrogen ions and acid ions, then it belongs to acid NaOH is composed of metal ions and hydroxide ions, and belongs to alkali;
NaCl can be understood as the product of the neutralization of hydrochloric acid and sodium hydroxide, which is composed of metal ions and acid ions, and belongs to salt;
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Anonymous users2024-01-28Chemically, salts in the broad sense are neutral (uncharged) ionic compounds composed of cations (positively charged ions) and anions (negatively charged ions)1Reaction with acid [metathesis reaction] acid + salt New salt + new acid (strong acid, weak acid) The salt here can be insoluble salt. [Example] 2HCl + Na2CO3 = H2O + CO2 + 2NaCl (carbonic acid is unstable and will continue to decompose into water and carbon dioxide) 2
Reaction with alkali [metathesis reaction] alkali (soluble) + salt (soluble) neoalkali + new salt [Example] 2NaOH + CuSO4 = Cu (OH)?↓na2so4 3.Reaction with some metals [displacement reaction] salt + metal (some) new metal + new salt The metal in the reaction must be more active than the metal in the salt before it can be replaced [Example] Zn+CuSO4=ZNSO4+CU Salts are also divided into normal salts, acid salts, neutral salts, basic salts, and double salts.
Positive salts: composed of metal ions (including ammonium ions) and non-metal ions Acid salts: composed of metal ions (including ammonium ions), hydrogen ions, acid ions and non-metal ions Basic salts:
Composed of metal ions (including ammonium ions), hydroxide ions, acid ions, and non-metal ions Complex salts: Composed of different metal ions (including ammonium ions) and acid ions Basic salts explained in detail The anions formed during ionization include hydroxide ions in addition to acid ions, and cations are metal ions (or NH?).+) of salt.
When an acid reacts with a base, the hydroxide ions in the weak base are partially neutralized, and the salt produced is a basic salt. Only basic salts, binary bases or polybases have the potential to form basic salts. The composition and properties of basic salts are complex and diverse.
Basic copper carbonate Cu2(OH)2CO3 and magnesium Mg(OH)Cl are all basic salts. Basic salts are the products of alkali being partially neutralized by acids.
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Anonymous users2024-01-27There are a lot of these, so let's pay attention to the accumulation at all times.
Compounds that are formed when ionized are all hydrogen ions are called acids. Such as H2SO4, HNO3, HCl, etc. are all acids. >>>More
Is the standard answer so much?
I'm not sure I'm right. >>>More
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How to say, you have to have a good foundation in learning chemistry, so I think you should look at the basic things now, really understand the inner things, don't rush to do the difficult questions first, and do the simple questions thoroughly. In addition, when learning chemistry, it is very important to learn to take notes, and you must write down what you think is useful, as the saying goes: "a good memory is better than a bad pen". >>>More
From the question, it can be seen that 25g of A and 15g of B can react completely, that is, the mass ratio of A and B participating in the reaction is 25:15, that is, 5:3, so in the first reaction, the mass ratio of A and B participating in the reaction is also 5: >>>More