Preparation and calibration of Mohr salt

A, ammonium ferrous sulfate standard _{solution: C [Fe (NH 4)} 2 Â· 6H 2 O] = 0.1mol / L, weighed 40g ferrous ammonium sulfate _{_{[Fe (NH 4) 2 Â·}} 6H 2 O], was dissolved In 1000 ml of 10% sulfuric acid solution, place in a brown bottle for use.

Second, the calibration imbibe 0.1mol / L ammonium ferrous sulfate solution, 10ml 3 ~ 4 parts, were placed in a 250ml conical flask, diluted with water to 60ml, add 1: 1 10ml of hydrochloric acid, 15% sulfuric acid 15ml and two phosphorus mixed aniline amine sulfonate 2 drops of indicator agent, a blue-violet solution was 0.0200mol / L potassium standard weight chromium solution was titrated to standard ferrous ammonium sulfate solution concentration is calculated.

3. Standard use solution of potassium dichromate: accurately remove 20 ml of stock solution of C(K ₂ Cr ₂ O ₇ )=1.0000mol/L, dilute to the mark in a 1000ml volumetric flask, shake up, and the concentration of the solution is C. (K ₂ Cr ₂ O ₇ ) = 0.0200 mol/L.

Note: Mohr salt ( ammonium ferrous sulfate)

Refrigerating Unit

There are many kind of refrigerating units, according to the volume type compressor including the following kinds:

1. According to the shape of compressor which is volume, can be divided into piston type and rotary type two kinds, at present, the piston type including full close and semi closed type compressor and rotary type including screw and scroll compressor. Generally, the scroll compressor is known as full closed compressor.

2. According to the number compressor units is divided into two kinds: single refrigeration unit and parallel refrigeration unit.

3. According to the condensing unit, it divided into air cooling and water cooling compressor unit.

4. According to the cooling media, it divided into fluorine refrigeration unit, ammonia refrigeration unit and water cooling unit.

The features:

This refrigerate unit is cabinet shape, structure tight, good performance;

This refrigerate unit is semi. Closed compressor unit, small vibration,low noise, and credible in operation.

With cooper,aluminum heat transformer, big air transit area, high heat transfer rate and long life period.

With outside rotating fan, low operation sound.

With inside wire connection box.

Compressor Unit, Refrigerating Unit

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