Question

При взаимодействии 1.76 г предельной одноосновной карбоновой кислоты с избытком раствора гидрокарбоната натрия выделилось 0.448 л газа (н.у) Установите структурную формулу кислоты если известно что в ее молекуле содержится третичный атом углерода

Answer 1

0,448 л СО2 это 0,448/22,4=0,02 моль.
Уравнение реакции: CnH(2n+1)COOH + NaHCO3 ---> CnH(2n+1)COONa + H2O + CO2
Значит 1,76 г кислоты это тоже 0,02 моль Молярная масса кислоты 1,76/0,02=88 г.
Такой массе соответствует (с учетом наличия третичного атома углерода) 2-метилпропановая (изомасляная) кислота: СН3-СН(СН3)-СООН.

Answer 2

Structural Formula of the Acid with a Tertiary Carbon Atom

The given information states that 1.76 g of a saturated monocarboxylic acid reacted with an excess of sodium hydrocarbonate solution, resulting in the evolution of 0.448 L of gas at standard temperature and pressure (n.t.p). It is also mentioned that the acid contains a tertiary carbon atom in its molecule.

Unfortunately, the search results provided do not contain specific information about the structural formula of the acid. However, we can still discuss the general approach to determine the structural formula of the acid.

To determine the structural formula of the acid, we need to consider the reaction between the acid and sodium hydrocarbonate. The evolution of gas suggests the formation of carbon dioxide (CO2) gas, which is a common product when carboxylic acids react with carbonates or bicarbonates.

The balanced chemical equation for the reaction can be represented as follows:

Acid + Sodium Hydrocarbonate → Carbon Dioxide + Sodium Salt of the Acid

Since the acid contains a tertiary carbon atom, we can assume that it is a tertiary carboxylic acid. Tertiary carboxylic acids have the general structural formula R-C(O)OH, where R represents a carbon chain or a substituent group attached to the carboxyl group.

Without specific information about the acid, it is not possible to determine its exact structural formula. However, based on the given information, we can conclude that the acid is a tertiary carboxylic acid with a structural formula of R-C(O)OH, where R represents the carbon chain or substituent groups attached to the carboxyl group.

Please note that this is a general conclusion based on the given information, and the specific structural formula of the acid cannot be determined without additional details.

I hope this explanation helps! Let me know if you have any further questions.