High school chemistry sodium and its compounds, high school chemical sodium and its compounds

Option B; Because aAfter a complete reaction, the resulting NCO = 1mol, under standard conditions = , it is impossible to be greater. A is not true.

b.Obviously, the CO2 used at the beginning is 1mol, NaHCO+HCl = NaCl + H2O + CO

This reaction consumes 1 mol of HCl (from NHCl = 3 to NHCL = 4 mol).

Consume HCl 3mol before

Even if Co reacts with NaOH all produce NaCo:

na₂co₃ +hcl = nacl + nahco3

This reaction consumes only 1mol of HCl, and the remaining 2mol of HCl reacts with NaOH. So, if there is NaOH in solution A, there can be no NaHCO

hcl + naoh = nacl + h2o

That is, there are 2mol NaOH in solution A, 1mol Na Co, and B is correct;

c.See b; c is not true;

d.C is not true, there are naoh and na2co

Choose BA: How much carbon dioxide is introduced, and when a sufficient amount of hydrochloric acid is added, it will all be released.

B: No need to calculate, as long as you know that the amount of hydrochloric acid required to produce carbon dioxide is less than the previous one, that is, it contains both sodium carbonate and sodium hydroxide:

na2co3+hcl=nahco3+nacl nahco3 + hcl = nacl + h2o + co2

A small part of it happens because it happens in the first step and also happens: NaOH + HCL = NaCl + H2O

C: The analysis process is the same as B

D: The analysis process is the same as B

The knowledge points of sodium and its compounds are summarized as follows:

1. Pay attention to the position of sodium metal in the periodic table and the order table of metal activities, and the physical properties of sodium metal.

The element sodium is located in the third period group a in the periodic table and is the most metallic element with the largest atomic radius in the short period.

The position of sodium in the periodic table and the metal activity sequence table reflects its strongest elemental reduction in short cycles, the strongest ability to react with acids to replace hydrogen, and the strongest alkalinity of the most ** oxide corresponding to hydrates. These characteristics are often used as a breakthrough in the derivation and determination of sodium in college entrance examination questions.

The most commonly used physical properties of sodium are: soft (can be cut with a knife), low melting and boiling point (the heat released by the reaction of sodium with water can melt it into a shiny ball), and low density (water, sodium, kerosene, when sodium is put into a mixture of kerosene and water, it will jump up and down at the boundary between the two).

2. The condition for the reaction between sodium metal and sulfur is grinding; Sodium metal is ignited and extended into a gas collector cylinder containing chlorine gas, and yellow flames and white smoke are observed.

3. Preservation of metal sodium, sodium peroxide and sodium hydroxide in the laboratory.

A small amount of sodium metal is kept in kerosene, and a large amount of sodium metal is kept in paraffin oil.

The sodium peroxide is placed in a plastic bag, sealed and kept in a tin can.

The reagent bottle containing the sodium hydroxide solution should not use a grinding glass stopper, but a rubber stopper should be used to prevent reaction with the main components of the glass: 2NaOH+SIO2 NA2SIO3+H2O, and the product NA2SIO3 is a mineral glue that will stick the mouth of the bottle and the stopper.

Properties of sodium and its compounds 1Sodium reacts with air Sodium oxidizes slowly in air: 4Na+O2==2Na2O Sodium burns in air: 2Na+O2 ==Na2O2 1 molar sodium metal reacts well with oxygen.

Properties of Na 1 Physical Properties: Chemical state, silvery-white, soft, water < kerosene, low melting and boiling point, good conductivity 2Chemical Properties: O2 Elemental: 4Na O2Na

Physical and chemical properties of sodium Physical properties x09 Sodium is a silvery-white, soft, knife cut metal, lighter than water, melting point, boiling point The chemical properties of sodium x09 react with oxygen: 4Na + O2 = 2N