قيمة الحمض

‎قيمة الحمض ‏Acid value‎ هي عدد ميليغرامات من هيدروكسيد البوتاسيوم ‎ KOH‏ اللازمة لتعديل الحموض الحرة في ١غ من الحمض الدسم او المادة المطلوب تحديد قرينة الحمض لها.

Animation that shows the titration process and that allows you to see how to make an acid-base titration graph.

The acid number is used to quantify the acidity of a substance e.g. biodiesel. It is the quantity of base, expressed in milligrams of potassium hydroxide, that is required to neutralize the acidic constituents in 1 g of sample.

$AN=(V_{eq}-b_{eq})N{\frac {56.1\,g\,mol^{-1}}{W_{oil}}}$

V_eq is the volume of titrant (ml) consumed by the crude oil sample and 1 ml of spiking solution at the equivalent point, b_eq is the volume of titrant (ml) consumed by 1 ml of spiking solution at the equivalent point, and 56.1 g/mol is the molecular weight of KOH. W_Oil is the mass of the sample in grams.

The molar concentration of titrant (N) is calculated as such:

$N={\frac {1000W_{KHP}}{204.23\,g\,mol^{-1}\,V_{eq}}}$

In which W_KHP is the mass (g) of KHP in 50 ml of KHP standard solution, V_eq is the volume of titrant (ml) consumed by 50 ml KHP standard solution at the equivalent point, and 204.23 g/mol is the molecular weight of KHP.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 انظر أيضاً

• قيمة التصبن
• Hydroxyl value
• Iodine value
• Peroxide value
• Amine value

 المراجع

‏ ‏