قيمة الحمض

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

‎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.

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.

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 انظر أيضاً

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

 المراجع

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