UC知道关于acid and base 的一些问题，谢谢了，急~
来源：百度知道 编辑：UC知道 时间：2024/05/31 13:40:09
Question 5. Calculate the ratio of the molarities of CO3
2- and HCO3
- ions required to achieve
buffering at pH 9.50. The pKa2 of H2CO3 is 10.25.
Question 6. A buffer solution was prepared by mixing 12.2 g of benzoic acid with 7.20 g of
sodium benzoate in 250 cm3 of water. What is the pH of the solution? What would the pH be if the
solution was diluted to 500 cm3? Ka = 6.3 x 10-5
Solubility products:
Question 7. Predict whether each of the following is soluble or insoluble in water:
(a) (NH4)2S (b) FeS (c) ZnCO3 (d) Hg2Cl2
Question 8. Calcium hydroxide dissolves in water to the extent of 0.93 g dm-3. What is the Ksp
of Ca(OH)2?
各位大哥 老师 达人 小弟先拜个谢了先 真的十分急 而且最好有解题思路 拜托了
2- and HCO3
- ions required to achieve
buffering at pH 9.50. The pKa2 of H2CO3 is 10.25.
Question 6. A buffer solution was prepared by mixing 12.2 g of benzoic acid with 7.20 g of
sodium benzoate in 250 cm3 of water. What is the pH of the solution? What would the pH be if the
solution was diluted to 500 cm3? Ka = 6.3 x 10-5
Solubility products:
Question 7. Predict whether each of the following is soluble or insoluble in water:
(a) (NH4)2S (b) FeS (c) ZnCO3 (d) Hg2Cl2
Question 8. Calcium hydroxide dissolves in water to the extent of 0.93 g dm-3. What is the Ksp
of Ca(OH)2?
各位大哥 老师 达人 小弟先拜个谢了先 真的十分急 而且最好有解题思路 拜托了
我做这些题目的简单思路
5。计算pH 9.50时候，缓冲溶液中CO3和HCO3的比。写出水解的方程式，然后根据缓冲溶液得最简计算公式，即http://sce.scnu.edu.cn/WebCai/analytical/chap_3/sect_4/know_3.html
该叶面上的第一个公式，可以求出二者的比值。
6。苯甲酸和苯甲酸钠混合溶液的计算，是弱酸和弱酸盐的相关计算，也给了Ka = 6.3 x 10-5 ，那么，计算变得很简单，相关步骤请参考，上述网页上第二个例题。
7。预测可溶性，根据常识和Ksp 判断，只有a可容
8。是溶解度和Ksp的换算。已知溶解度，可以求出溶液中粒子的浓度，进而求出溶解度。
对于这些问题，是分析化学中常见的问题，科研中真正遇到这些问题的时候，往往会根据现有的计算公式或者计算程序进行计算，也可以用仪器测定，现实中的问题往往比较复杂，以上的问题简单明快，适合作为考试题目。