代码代写:化学实验

08 5月 代码代写:化学实验

代码代写:化学实验

鉴定出的化合物是KNO3。它是完全溶于水,作为第一个测试溶解度在水中0.1毫克的化合物揭示。溶解度为0.5g/10ml, 25C。KNO3的基本物理性质是它在水中的溶解度。它溶于水和甘油,部分溶于酒精。其次,进行PH测试,以检查其酸性或碱性。试验采用PH试纸进行。PH测试条带将显示酸性化合物的PH<7,碱性化合物的PH>7。在未知化合物的情况下,可以确定溶解粉末的PH值在7左右,这表明是中性化合物。KNO3的pH值约为7。在进行火焰测试时,发现该未知化合物含有钾离子,因为在火焰测试中,该化合物燃烧时呈紫色。只有KCl、K2SO4和KNO3这三种物质可以燃烧紫色。根据该化合物的溶解度鉴定,确定该化合物在25C下以0.5g/10ml溶解,pH值约为7。粉末中鉴定的阳离子为火焰试验确定的钾离子。
在第二组实验中,将该化合物与其他类似化合物进行比较。首先,对CO3进行了测试。实验中,在溶液中加入0.1M Hcl,反应没有起泡,所以化合物中没有CO3。其次,对氯进行了检测,确定了氯中不含卤化物离子。最后,对KNO3进行了测试,发现在FeSO4和H2SO4与化合物混合的结合处形成了一个棕色的环。这里我们遇到了一个问题,因为首先没有出现棕色环。由于其他试验均为阴性,且上次试验中没有白色沉淀,使Cl离子为阴性,所以我们重新进行了棕环试验。使用相同的电抗,我们将带横档的管子与蒸馏水的管子进行比较,以找出黑暗中的差异,我们确定KNO3为未知化合物。通过火焰试验确定了正离子为K,硝酸根试验确定了负离子为NO3。

代码代写:化学实验

The compound identified is KNO3. It is perfectly soluble in water as the first test for solubility in water with 0.1 mg of the compound revealed. Solubility was established at 0.5g/10ml at 25C. The basic physical property of KNO3 is its solubility nature in water. It is soluble in water and in glycerol and is partially soluble in alcohol.Secondly, the PH test was conducted to check for its acidic or basic properties. The test was conducted by use of a PH test strip. The PH test strip will show PH<7 for compounds that are acidic and would show PH>7 for compounds that are basic. In the case of the unidentified compound, it was established that the PH of the dissolved powder is around 7 and this shows a neutral compound. KNO3 has a pH of about 7.In conducting, the flame test, it was identified that the unknown compound contains a potassium cation, because in the flame test, the compound burned purple in color. Only three substances could burn purple in colors which are KCl, K2SO4, and KNO3. Based on the solubility identified of the compound it was established that the compound that dissolves at 0.5g/10ml at 25C with a pH of about 7. The cation in the powder identified was potassium as established in the flame test.
In the second set of experiments, the compound was compared to similar other compounds. Firstly, a test for CO3 was conducted. In the test, 0.1M Hcl was added to the solution and it was identified that the reaction did not fizz so there was no CO3 in the compound. Secondly, a test for Cl was conducted and in it the absence of halide ions was established. Finally, the test for KNO3 was conducted and it was identified that a brown ring was formed at the junction of FeSO4 and the H2SO4 mixed with the compound. Here we faced an issue because firstly the brown ring did not appear. Since all other tests were negative, and there was no white precipitate in the last test, negating the Cl ion, we redid the brown ring test. Same amount of reactance was used, and we compared the tube with rung to another with distilled water in order to find out the difference in darkness and we established KNO3 as the unknown compound. The cation is K by flame test and the anion is NO3 by the nitrate test was hence established.