一元酸的判断及应用（The judgment and application of monic acid）.docVIP

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一元酸的判断及应用（The judgment and application of monic acid）.doc

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一元酸的判断及应用（The judgment and application of monic acid）

一元酸的判断及应用（The judgment and application of monic acid） The judgement method and application of a weak acid Luan chunwu, no.1 middle school of xuanhua county, hebei province In the process of learning chemistry in middle school, we often encounter the strong and weak judgment of the unitary acid, and the following are summarized as follows: 1. To see whether a monoacid (HB) is completely ionized in an aqueous solution, and if there is an equilibrium in the aqueous solution, HB is a weak acid. (1) it is judged by pH The pH of the concentration of the substance of the known substance, HB, if the pH is greater than the pH of the same concentration of one, the HB is a weak acid. Take a certain volume of HB solution, determine its pH, and dilute it 100 times. If the degree of pH increase is equal to 2 units, HB is strong acid; If the degree of pH is less than 2 units, HB is a weak acid. Take the HB solution, measure its pH, and then heat it up. If the pH is small, the HB is a weak acid (volatile and easy to decompose acid is not normally used in this method). Take the HB solution, measure its pH, and then add the NaB solid, if the pH gets bigger, the HB is a weak acid. 2. Determine the amount of gas produced Volume and pH were the same HB solution and hydrochloric acid, respectively, add plenty of grain size of the same zinc granule, at the same time, if the HB collected more than collected in hydrochloric acid gas, explain HB for weak acid. 3. Determine the rate of gas production The same HB solution and hydrochloric acid are used to get the same amount of substance, and the same zinc granules with the same size are added respectively. If the bubbles generated in the hydrochloric acid at the beginning are faster than those produced in HB, the HB is weak acid. 4. Judgment by conducting capacity The HB solution and hydrochloric acid of the same amount of the same substance are obtained respectively, and the conductivity capacity of HB is measured. If the conductivity of HB