(Acetic Acid: pKa = 4.74) What is the pH of the buffer prepared by adding 20 mL of 0.20 M sodium hydroxide to 50 mL of 0.10 acetic acid? (pKa of acetic acid = 4.76) A buffer solution is prepared by adding 15.00 g of s...
HCL is a strong acidic component. It is abbreviated as hydrochloric acid. It is a colorless solution. It gives a pungent smell. In animal cells, it is the important gastric solution present in the stomach, which helps in the digestion of food substrates. Answe...
What is the endpoint volume (Ve) of the titration of 50.00 mL of 0.025 00 M MES with 0.100 0 M NaOH, where MES is a weak acid with pKa = 6.27? Additionally, describe the behavior at each of the four stages of the titration: Va = 0, 2, 5, 10, 10.1, 11, 12, ...
患者男,72岁。1个月前因急性脑梗死致左侧肢体偏瘫入院,2周前出院。社区护士对其进行访视,发现患者目前意识清醒,血压维持在145/95 mmHg左右。左侧肢体瘫痪,右侧肢体肌力好,皮肤完整性好。语言表达部分障碍。目前久卧在床,可在床上独立进餐,现由老伴照顾。首选的健康教育形式是 ...
The weak acids H3BO3 (pKa=9.24) and CH3COOH (pKa= 4.75) can be titrated with standard alkaline solution directly. A. 正确 B. 错误 查看完整题目与答案 空气是人类生存所必需的重要资源。为改善空气质量而启动的“蓝天工程”得到了全民的支持。下列措施中不属于“蓝天工程”建设的是( )。 A. 推...
what is the molarity of a 30% (vol/vol) solution of H2SO4 (density of H2SO4=1.8g/ml)答案5.5Mwhich of the following acids is the weakest?A.HF kA=6.8*10的-4次方 B.H3PO4 kA= 7.5*10的负三次方 C.HNO2 kA=4.5*10的-4次方 D.CH3COOH kA=1.8*10的-5次方 E.H2S kA=1.1*10的-7...
Ammonia is a weak base that ionizes to a limited extent in aqueous solution. The extent to which a weak base ionizes in aqueous solution is given by percent ionization. The formula percent ionization is given below. {eq}\rm \%\ ~ ionization~=~\frac{BH^+_{eq}}{C_{B}}\t...
For example, iron and oxygen combine to form rust. A chemical reaction is important for all living organisms like plant growth, fruit production, digestion, wound healing, and reproduction.Answer and Explanation: When potassium hydroxide combines with carbon dioxide, it produces potassium c...
阶段、“计划经济与市场调节相结合”阶段“建立“会主义市场经济体制”阶段。这一认识过程表明（）。 ①每一时期的人们对客观事物的正确认识总是有局限的 ②正确的认识中包含有错误，错误的认识里也有正确的成分 ③人们对客观事物的认识总是不断地深化 ④由于历史条件的限制，人们不可能获得真正正确的认...
患者男,72岁。1个月前因急性脑梗死致左侧肢体偏瘫入院,2周前出院。社区护士对其进行访视,发现患者目前意识清醒,血压维持在145/95 mmHg左右。左侧肢体瘫痪,右侧肢体肌力好,皮肤完整性好。语言表达部分障碍。目前久卧在床,可在床上独立进餐,现由老伴照顾。首选的健康教育形式是 ...