It is necessary to calculate the mass of a solid acid which will react with about 20 cm < sup > 3 </ sup > of this solution ( for a titration using a 25 cm < sup > 3 </ sup > burette ): suitable solid acids include oxalic acid dihydrate, potassium hydrogen phthalate and potassium hydrogen iodate.

The known solution should then be allowed out of the burette, into the conical flask.

The solution should be let out of the burette until the indicator changes colour and the value on the burette should be recorded.

François-Antoine-Henri Descroizilles developed the first burette ( which was similar to a graduated cylinder ) in 1791.

Joseph Louis Gay-Lussac developed an improved version of the burette that included a side arm, and coined the terms " pipette " and " burette " in an 1824 paper on the standardization of indigo solutions.

A major breakthrough in the methodology and popularization of volumetric analysis was due to Karl Friedrich Mohr, who redesigned the burette by placing a clamp and a tip at the bottom, and wrote the first textbook on the topic, Lehrbuch der chemisch-analytischen Titrirmethode ( Textbook of analytical-chemical titration methods ), published in 1855.

A typical titration begins with a beaker or Erlenmeyer flask containing a precise volume of the titrand and a small amount of indicator placed underneath a calibrated burette or chemistry pipetting syringe containing the titrant.

* 1824 – He developed an improved version of the burette that included a side arm, and coined the terms " pipette " and " burette " in an 1824 paper about the standardization of indigo solutions.

A burette ( also buret ) is a vertical cylindrical piece of laboratory glassware with a volumetric graduation etched permanently on its full length and a precision tap, or stopcock with plug and bore, on the bottom.

These are used much like a burette, in that the volume is found by calculating the difference of the liquid level before and after liquid is dispensed.

A meniscus as seen in a burette of colored water.

The burette would normally be held by a clamp, not shown here.

First, the burette should be rinsed with the standard solution, the pipette with the unknown solution, and the conical flask with distilled water.

The initial and final readings on the burette ( prior to starting the titration and at the end point, respectively ) should be recorded.

This is best achieved by washing a hanging drop from the tip of the burette into the flask right at the end of the titration to achieve a drop that is smaller in volume than what can usually be achieved by just dripping solution off the burette.

He invented an improved burette which had a tip at the bottom and a clamp ( a ' Mohr's clip '), which made it much easier to use than its predecessors, which were more similar to a graduated cylinder.

During Oersted's attendance at the university, it was poorly equipped with physical apparatus for experimenting in the sciences.

Corrections were applied for modulation broadening, apparatus background, and field shift.

A special template is furnished with the apparatus to enable marking a specimen for a central measuring area and the fabric extensions to the clamps ( see Fig. 2 ).

One mechanism for maintaining the blood pressure is the release of a protein called renin from cells in the kidney ( to be specific, the juxtaglomerular apparatus ).

As a metal, beryllium is transparent to most wavelengths of X-rays and gamma rays, making it useful for the output windows of X-ray tubes and other such apparatus.

He experimented with designing a new apparatus for human propulsion of small boats.

An apparatus ( 4-5 cm length, with 9 short needles ) used for BCG vaccination in Japan, shown with ampules of BCG and saline

The world's first computer printer was a 19th century mechanically driven apparatus invented by Charles Babbage for his difference engine.

Capitalism entails the private ownership of the latter two — natural resources and capital goods — by a class of owners called capitalists, either individually, collectively or through a state apparatus that operates for a profit or serves the interests of capital owners.

# Make sure patient is in an actual comatose state and is not mistaken for locked-in state ( patient will either be able to voluntarily move his eyes or blink ) or psychogenic unresponsiveness ( caloric stimulation of the vestibular apparatus will result in slow deviation of eyes towards the stimulation followed by rapid correction to mid-line ; this response can't be voluntarily suppressed: therefore, if the patient doesn't have this response, then psychogenic coma can be ruled out as a differential )

Also, while elementary particles showed predictable properties in many experiments, they became highly unpredictable in certain contexts, for example, if one attempted to measure their individual trajectories through a simple physical apparatus.

So if an electron passes through a double slit apparatus there are various probabilities for where on the detection screen that individual electron will hit.

( radio apparatus " means a device or combination of devices intended for, or capable of being used for, radiocommunication ).

The Golgi apparatus is a large organelle that processes proteins and prepares them for use both inside and outside the cell.

As UCLA law professor Stephen Yeazell has pointed out, the most likely reason is that the abysmally poor transportation, communications, and administrative apparatus of medieval times made it impossible for the English sovereign to directly manage the entire country in terms of individuals ; it was easier to structure society by imposing obligations upon groups which were enforced by the sporadic use of force.

To do this a " cow " or " pig " adaptor can be added to the end of the condenser, or for better results or for very air sensitive compounds a Perkin triangle apparatus can be used.

With the key activists of the Nationalist Clubs largely absorbed into the apparatus of the People's Party, Bellamy abandoned politics for a return to literature.

Arne Tiselius developed the first sophisticated electrophoretic apparatus in 1937 and some years later he was awarded the 1948 Nobel Prize for his work in protein electrophoresis.

The Golgi apparatus is a series of multiple compartments where molecules are packaged for delivery to other cell components or for secretion from the cell.

He argues in favor of a society organized around a market order, in which the apparatus of state is employed almost ( though not entirely ) exclusively to enforce the legal order ( consisting of abstract rules, and not particular commands ) necessary for a market of free individuals to function.

The turmoil caused a severe food shortage, destroyed the Finnish economy, demolished the political apparatus and divided the Finnish nation for many years.

Working with the company, ” Carmichael and Fairbanks ”, William Smith Otis devised an apparatus carrying out the same actions as the person with a shovel.

At the head of the state apparatus responsible for formally adopting and carrying out policies elaborated by the party congress and Politbüro was the Council of Ministers, which had more than forty members and was in turn headed by a Presidium of sixteen.

All of the apparatus carrying the blood outside the body is termed the extracorporeal circuit.

It also charges the Lebanese government with " a failure ... to provide adequate protection for its citizens ," thereby contributing to " the propagation of a culture of intimidation and impunity ," and accuses the Lebanese security forces with " serious and systematic negligence in carrying out the duties usually performed by a professional national security apparatus.

*-G. Plauson-" Method of carrying out electrochemical reactions and apparatus for the use therein "

Specific functional responsibilities of the Council of Ministers included directing and planning the national economy ; solving problems growing out of membership in the Council for Mutual Economic Assistance ( Comecon — see Appendix B ); coordinating and implementing social policy decisions that have been agreed upon with the support and concurrence of the Free German Trade Union Federation ( Freier Deutscher Gewerkschaftsbund -- FDGB ); instructing and controlling subordinate levels of government, i. e., the councils at district, county, and community levels that implemented the laws and decisions of the central government ; improving the functioning of the system of " democratic centralism " within the state apparatus ; and carrying out the basic foreign policy principles of the socialist state.