pH of a equi-molar solution of Na-carbonate is much higher ( >10 mostly) than of the same Na-bicarbonate (pH roughly 8).
The first contains a (bi-ionic) double base: CO32-
while the 2nd contains one mono-acid and a mono-basic (ampholyte) ion: HCO3-
The pKa value for sodium bicarbonate (NaHCO3) is 10.3. This provides a measure of the acid strength of bicarbonate. People often make the mistake of reporting the pKa value of 6.3 for bicarbonate. However, that is the pKa value of carbonic acid (not bicarbonate). It relates to the ease of the first deprotonation of carbonic acid to form bicarbonate. The pKa of bicarbonate relates to the deportation of bicarbonate to form carbonate. This distinction is important, since carbonic acid has two pKa's, the higher of which represents that second deprotonation.
Sodium benzoate is a preservative, e.g. in beveages, salads, pickles and seafood. It prevents spoilage by yeast at lower pH values (soured products).The other three are not.And only 'sodium bi carbonate' (sodium hydrogen carbonate is a better name) is used as auxillary in baking, called 'baking powder'.
It depends on the concentrations of these substances. However, sodium hydroxide is a very strong base and therefore is capable of producing solutions with high pH values. On the other hand, sodium hydrogen carbonate is weakly acidic, and is therefore capable of producing solutions that are somewhat less than neutral. (Carbonic acid is itself a weak acid.)
In order of increasing pH: (calculated 'pH about'-values are given for 1.0 M solutions)sodium bisulfate Na+(HSO4)- is weak acidic, pKa= 1.92, (pH about 1.0)acetic acid H(OOCCH3) is weakly acidic, pKa= 4.77, (pH about 2.4)neutral: water pKa= 14, pKb= 14 so pH= 7.0sodium acetate Na+(OOCCH3)- is weakly basic, pKb= 9.23, (pH about 9.4)sodium carbonate (Na+)2(CO3)2- is weakly basic, pKb=3.75, (pH about 12.1)
The molar mass of Na2CO3 (sodium carbonate) is approximately 105.99 g/mol. To calculate the KB, you would first look up the pKa values for the conjugate acid (HCO3-) and then use the relation KB = Kw / Ka.
The pKa value for sodium bicarbonate (NaHCO3) is 10.3. This provides a measure of the acid strength of bicarbonate. People often make the mistake of reporting the pKa value of 6.3 for bicarbonate. However, that is the pKa value of carbonic acid (not bicarbonate). It relates to the ease of the first deprotonation of carbonic acid to form bicarbonate. The pKa of bicarbonate relates to the deportation of bicarbonate to form carbonate. This distinction is important, since carbonic acid has two pKa's, the higher of which represents that second deprotonation.
Sodium benzoate is a preservative, e.g. in beveages, salads, pickles and seafood. It prevents spoilage by yeast at lower pH values (soured products).The other three are not.And only 'sodium bi carbonate' (sodium hydrogen carbonate is a better name) is used as auxillary in baking, called 'baking powder'.
It depends on the concentrations of these substances. However, sodium hydroxide is a very strong base and therefore is capable of producing solutions with high pH values. On the other hand, sodium hydrogen carbonate is weakly acidic, and is therefore capable of producing solutions that are somewhat less than neutral. (Carbonic acid is itself a weak acid.)
In order of increasing pH: (calculated 'pH about'-values are given for 1.0 M solutions)sodium bisulfate Na+(HSO4)- is weak acidic, pKa= 1.92, (pH about 1.0)acetic acid H(OOCCH3) is weakly acidic, pKa= 4.77, (pH about 2.4)neutral: water pKa= 14, pKb= 14 so pH= 7.0sodium acetate Na+(OOCCH3)- is weakly basic, pKb= 9.23, (pH about 9.4)sodium carbonate (Na+)2(CO3)2- is weakly basic, pKb=3.75, (pH about 12.1)
The molar mass of Na2CO3 (sodium carbonate) is approximately 105.99 g/mol. To calculate the KB, you would first look up the pKa values for the conjugate acid (HCO3-) and then use the relation KB = Kw / Ka.
Lab values that are not affected by sluggish blood flow include electrolyte levels (sodium, potassium, chloride, bicarbonate), creatinine, and thyroid hormones (T3, T4, TSH). These values are typically not influenced by the rate of blood flow through the body.
An examination of ka values indicates that carboxylic acids are moderately strong acids. Thus, they undergo acid/base reactions with weak bases such as sodium bicarbonate (ka of which is 10^-7). Having said that, they would also undergo acid/base reactions with stronger bases such as sodium hydroxide. There is no ppt because the products of an acid/base reaction is an ionic salt.
Hemolysis can falsely elevate sodium values due to release of intracellular sodium from red blood cells during the process of hemolysis. This can lead to inaccurately high sodium measurements in the blood sample.
Methyl orange changes color over a range of pH values, making it difficult to identify the exact equivalence point when titrating HCl with sodium carbonate. This can lead to inaccurate results and a lack of precision in the standardization process. A pH indicator with a sharper color change near the equivalence point, such as phenolphthalein, is more suitable for this titration.
The difference electronegativity values of sodium and bromine are; Sodium(Na) 0.9, Bromine(Br) 2.8 thus a difference of 1.9.
Water solution of sodium chloride is neutral.
A water solution of sodium chloride is neutral.