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#buffer

6 public questions tagged with this topic.

Animal Tissue Culture 1

Which buffer requires CO₂ atmosphere to maintain pH?

Effective buffering strategies differ in reliance on volatile component dictating need for controlled atmosphere. Bicarbonate carbon dioxide system is open buffer where one component gaseous carbon dioxide exchanges with atmosphere, concentration governed by Henry's law gas partial pressure. Chemistry: dissolution CO2 plus water yields carbonic acid catalyzed by intracellular carbonic anhydrase zinc metalloenzyme with His three coordinating zinc activating water as hydroxide attacking CO2, turnover 10^6 per second, spontaneous dissociation H2CO3 ↔ H+ plus HCO3- with pKa 6.1. Medium pH governed

Ref: Lodish Molecular Cell Biology bicarbonate open system requires CO2 volatile; NCBI Bookshelf Animal Cell Culture closed buffers phosphate HEPES.

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Acid-Base Theories - Arrhenius Bronsted-Lowry Lewis and Salts Hydrolysis

A weak acid HX has Ka = 2.5 × 10⁻⁶ . What is the pH of a solution made by mixing 0.1 M HX and 0.05 M NaX ?

Using Henderson-Hasselbalch: pH = pKa + log ([X-]/[HX]) , pKa = -log(2.5 × 10⁻⁶) ≈ 5.6 , ([X-]/[HX]) = (0.05/0.1) = 0.5 , pH = 5.6 + log 0.5 = 5.6 - 0.301 = 5.3 .

Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Acid-Base Theories - Arrhenius Bronsted-Lowry Lewis and Salts Hydrolysis

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pH and Buffer

What happens to pH when a strong base is added to a buffer?

Increases slightly correctly describes the effect or change asked about in this question. In pH and Buffer, understanding cause-and-effect relationships is essential for predicting biological outcomes. Increases slightly occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (Decreases significantly, Remains constant, and Becomes neutral) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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pH and Buffer

Which of the following buffers is most important in human blood?

Phosphate buffer is the scientifically accurate answer to this question. Within the study of pH and Buffer, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Phosphate buffer directly address what is being asked. Among the other options, Carbonate buffer, Acetate buffer, and Borate buffer do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this to

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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Titration of Amino Acids

The Henderson-Hasselbalch equation is most useful for calculating:

pH of a solution containing a weak acid and its conjugate base is obtained by applying the relevant formula or quantitative relationship to the given parameters. In Titration of Amino Acids, numerical problem-solving requires understanding the mathematical relationships between biological variables. The calculation involves substituting the provided values into the appropriate equation and solving systematically. The other options (Net charge of a protein, Protein solubility, and The isoelectric point of an amino acid) result from common calculation errors such as using incorrect formulas, mis

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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Titration of Amino Acids

Which amino acid has a pKR value that allows it to act as a buffer at physiological pH?

Histidine is obtained by applying the relevant formula or quantitative relationship to the given parameters. In Titration of Amino Acids, numerical problem-solving requires understanding the mathematical relationships between biological variables. The calculation involves substituting the provided values into the appropriate equation and solving systematically. The other options (Glutamate, Arginine, and Lysine) result from common calculation errors such as using incorrect formulas, misidentifying variables, inverting ratios, or making arithmetic mistakes.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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