关键区别 - P碱度与M碱度
The termalkalinity指的是aqueoussolution required to neutralize the酸度由An引起acid。虽然碱度与basicityof an aqueous solution such as water, blood, etc., it measures the resistance of the solution towards thephchanges due to the presence of an acid. The major ions that contribute to the alkalinity of water are羟ions (OH–),碳酸盐ions (CO32-) andBicarbonateions (HCO3-). Alkalinity is categorized into three groups according to the终点given when an aqueous basic solution istitratedwith an acid. Caustic Alkalinity, p Alkalinity, and m Alkalinity are these categories. This article focus on the difference between p alkalinity and m alkalinity. The names p Alkalinity and m Alkalinity are given depending on the indicator that is used in the titration process. The key difference between p Alkalinity and m Alkalinity is thatP碱度确定所有羟基和一半碳酸盐的碱度whereasm Alkalinity determines alkalinity of all Hydroxyl, Carbonate and Bicarbonate.m Alkalinity is considered as the general or total alkalinity because carbonate species play a major role in total alkalinity of water.
内容
1.Overview and Key Difference
2.What is p Alkalinity
3.What is m Alkalinity
4.并排比较 - p碱度与表格形式的碱度
5.概括
What is p Alkalinity?
The term p Alkalinity stands for “Phenolphthalein – Alkalinity”。它是氢氧化的测量–) and carbonate ion (CO3-2) amount. It is determined by titrating a water sample with an acid of a known concentration in the presence of phenolphthalein as the indicator. To understand what happens in this titration, it is important to know about the解离of carbonic acid.
Figure 01: Titration curve for carbonic acid using phenolphthalein and thymol blue as indicators.
The above curve shows what happens during the titration of carbonic acid. It is a diprotic acid and can remove twohydrogen atoms称为质子。曲线的上部表明碳酸盐和羟基离子量在酚胺的pH范围内给出。由于苯甲胺蛋白给出颜色变化的pH范围为8.3 - 10.0，因此在该pH范围内测量了P碱度。在这里，以下关系用于解释用于滴定的特定样品的碱度。
1 ml酸= 1 meq/l碱度
What is m Alkalinity?
氢氧化物的总测量（OH–），碳酸氢盐（HCO3–) and carbonate (CO32-) ions amount is given by m Alkalinity. The letter m refers to Methyl orange. It is the indicator that is used to determine the total alkalinity given by the above hydroxide and carbonate species. When methyl orange is added, it gives its color change only in its pH range which is, 3.1 – 4.4. Since only trace concentrations of other acids are dissolved in water except for carbonic acid, m Alkalinity can be considered as the total alkalinity because it gives the total carbonate alkalinity.
What is the difference between p Alkalinity and m Alkalinity?
P碱度与M碱度 |
|
| p alkalinity is the measurement of alkalinity given by hydroxide ions and half of the carbonate alkalinity. | 米一个lkalinity is the measurement of alkalinity given by hydroxide ions and total carbonate alkalinity. |
| 指标 | |
| Phenolphthalein indicator is used to determine p alkalinity. | 甲基橙用于确定碱度。 |
| phRange | |
| p alkalinity is measured at a range of 8.3 – 10.0 pH. | 米一个lkalinity is measured at a pH range of 3.1 – 4.4. |
| 碳酸盐物种 | |
| p alkalinity mainly determines OH–and HCO3–物种。 | m碱性决定哦–，HCO3–and CO32-物种。 |
摘要 - P碱度与M碱度
By measuring the p alkalinity and m alkalinity, one can calculate the amount of total inorganic carbon that is dissolved in the sample. A number of acids are naturally dissolved in water but in trace concentrations. However, carbonic acid is found in high concentrations because CO2可以溶解在水中。因此，水的总碱度通常等于碳酸盐碱。P碱度和M碱度之间的主要区别在于，碱度是氢氧化离子给出的碱度和一半碳酸盐碱度的测量值，而M碱度是盐酸的测量值，是氢氧化离子和总碳酸含量的碱度。
Download PDF Version of p Alkalinity vs m Alkalinity
You can download PDF version of this article and use it for offline purposes as per citation notes. Please download PDF version hereP碱度和M碱度之间的差异。
Reference:
1.“滴定弱含酸的滴定”。Libre文本化学。N.P.，2016年1月6日。Available here。5 June 2017.
Image Courtesy:
1.较慢 - 自己的作品的“ Titcurve H2CO3”(CC BY-SA 3.0)viaCommons Wikimedia
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