How do you calculate the pH of sodium benzoate?
1 Expert Answer
- C 6H 5COO – + H 2O ==> C 6H 5COOH + OH –
- Kb = Kw/Ka = 1×10 -14 / 6.50×10 -5 = 1.54×10 -10
- Kb = 1.54×10 -10 = [C 6H 5COOH][OH -]/[C 6H 5COO -]
- 1.54×10 -10 = (x)(x)/0.1-x and assuming x is small, we have….
- 1.54×10 -10 = x 2/0.1.
- x 2 = 1.54×10 -11
- x = 3.92×10 -6 = [OH-]
Is sodium benzoate suitable to be used as preservative if the pH of a fruit juice is more than 6?
Benzoic acid and sodium benzoate are used as food preservatives and are most suitable for foods, fruit juices, and soft drinks that are naturally in an acidic pH range.
What functional group is sodium benzoate?
Sodium benzoate
| Names | |
|---|---|
| Density | 1.497 g/cm3 |
| Melting point | 410 °C (770 °F; 683 K) |
| Solubility in water | 62.69 g/100 mL (0 °C) 62.78 g/100 mL (15 °C) 62.87 g/100 mL (30 °C) 71.11 g/100 mL (100 °C) |
| Solubility | soluble in liquid ammonia, pyridine |
Did the pH have an effect on the food preservative?
The lower the pH reading, the more acid the food. In order to preserve foods with acidity, the regulation requires the pH to be 4.6 or below. At these levels, toxins formed by the deadly organism causing botulism are inhibited. We refer to foods which have readings greater than pH 4.6 as low-acid foods.
What is the pH of a 0.1 M sodium benzoate?
8.60
Answer and Explanation: Thus, the pH value of the solution is 8.60.
What is pH of solution of 0.05 M sodium benzoate?
4.50
A solution composed of 0.05 molar benzoic acid and 0.1 molar sodium benzoate gives a pH of 4.50 at 25 degrees C.
Does sodium benzoate lower pH?
Sodium Benzoate is the inactive salt of benzoic acid. It is soluble in water where it converts to benzoic acid, its active form, at a low pH. Benzoic acid is very pH dependent. While it shows some activity up to pH 6 (about 1.55%), it is most active at pH 3 (94%)….Info.
| pH | % Active Benzoic Acid |
|---|---|
| 6 | 1.55 |
| 7 | 0 |
Can sodium benzoate be used as preservative?
Sodium benzoate is generally recognized as safe and can be used as an antimicrobial agent and flavoring agent in food with maximum usage of 0.1%. It’s also generally recognized as safe (GRAS) when used as a preservative in feed. Many customers have concerns about preservatives such as sodium benzoate.
Why is sodium benzoate soluble in cold water?
The abundant OH- ions will react fully with benzoic acid in acid-base reaction to form water and benzoate ion, which now is soluble in water due to strong ion-dipole forces of attraction.
What food products contain sodium benzoate?
It can be found in foods such as pickles, sauces, jams and fruit juices. Foods that contain vinegar, such as salad dressings, typically contain very high levels of sodium benzoate. Benzene, a precursor to sodium benzoate, can be found in very small amounts naturally in some fruits, vegetables, meats, dairy products and even drinking water.
Is sodium benzoate the same as citric acid?
Citric acid in combination with Sodium Benzoate will not lead to the formation of Benzene but you should be careful using Ascorbic acid and Citric acid in the same formulation, because Citric acid could accelerate the formation of Benzene.
Is sodium benzoate harmful for health?
Sodium benzoate is a type of salt preservative found in a variety of foods, beverages and condiments, according to the National Center for Biotechnology Information (NCBI). While it is generally recognized as safe in small doses, sodium benzoate may cause harmful health effects under certain conditions.
Why is sodium benzoate more soluble in water than benzoic acid?
The two compounds are being considered together because it is undissociated benzoic acid that is responsible for its antimicrobial activity. As benzoic acid itself is only slightly soluble in water, sodium benzoate — which, under acid conditions, converts to undissociated benzoic acid — is often used instead.