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Which of the following do you think is a correct statement?
  • a)
    Ammonium hydroxide / ammonium chloride is an acidic buffer
  • b)
    boric acid / borax is an acidic buffer
  • c)
    henderson hasselbalch equation is given by pH = pKb + log[salt]/[acid]
  • d)
    PH + pOH = 4
Correct answer is option 'B'. Can you explain this answer?
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Which of the following do you think is a correct statement?a)Ammonium ...
Ammonium hydroxide / ammonium chloride is a basic buffer, henderson hasselbalch equation is given by pH = pKa + log[salt]/[acid] and pH + pOH = 14. So the only correct statement is that boric acid / borax is an acidic buffer.
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In its refined form, iron is a shiny, silver-gray metal; however, when refined iron is exposed to atmospheric conditions for an extended period of time, its surface becomes flaky, pitted, and red- or orange-colored. This process is known as "rusting," and the new flaky, orange or red substance is called "rust."Below, two scientists discuss how rust forms and the composition of rust.Scientist 1:Both water and oxygen are needed for rust to form. Water is an electrolyte, meaning that it allows ions to move within it. When iron comes into contact with water, some iron naturally dissociates into iron ions (Fe2+) and free electrons. Additionally, when atmospheric oxygen (O2) dissolves in water, some oxygen reacts with water to form hydroxide ions (OH-). Because water allows ions to move freely, iron ions and hydroxide ions combine to form a new compound: iron hydroxide. However, iron hydroxide is not a stable compound. Over time, as water evaporates, it changes into a hydrated form of iron oxide. This is rust.Salts can act as catalysts for rust formation, meaning that they speed up the rate at which rust forms. However, rust can form in pure water, in the absence of added salts.Increasing the ambient temperature increases the rate of rust formation. Additionally, increasing the amount of irons surface area that is exposed to water also increases the rate at which rust forms. However, because a layer of rust is porous to water and oxygen, water and oxygen will continue to cause the interior of a piece of iron to rust even after the irons surface has been rusted.Scientist 2:Attack by acids causes rust to form. In water, acids ionize to create positively-charged hydronium (H+) ions and negatively-charged anions. Hydronium ions are electron-deficient; because of this, they attract electrons from iron. This creates iron ions (Fe2+), which are soluble in water. Once dissolved in water, iron ions react with dissolved atmospheric oxygen (O2) to create iron oxide, or rust.Acids can come from a variety of sources. For example, when carbon dioxide in the atmosphere dissolves in water, carbonic acid (H2CO3) is created. Carbonic acid is the most common cause of rusting. However, other environmental sources of acids exist. Rainwater is normally slightly acidic because it has come into contact with molecules in the atmosphere, like sulfur dioxide and nitrogen oxides. These molecules also dissolve in water to form acids. Additionally, iron itself may contain impurities such as phosphorous and sulfur, which react with water to produce acids. Both acidic environments and impurities within iron itself create the conditions under which iron rusts.Rusting can be prevented by painting the surface of iron, thus preventing it from coming into contact with water, oxygen, and acids. Iron can also be protected in a process called "galvanizing," which involves coating iron in a thin layer of zinc. Because zinc is more reactive than iron, it is corroded while the iron is protected.Q. Given that all of the following are true, which of the following, if found, provides the strongest evidence against Scientist 1s hypothesis?

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Which of the following do you think is a correct statement?a)Ammonium hydroxide / ammonium chloride is an acidic bufferb)boric acid / borax is an acidic bufferc)henderson hasselbalch equation is given bypH = pKb+ log[salt]/[acid]d)PH + pOH = 4Correct answer is option 'B'. Can you explain this answer?
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