When first precipitated the hydroxides are all readily soluble in acids, but aluminium hydroxide dissolves with considerable difficulty after standing or boiling for some time.
To the combined filtrates from the double precipitation of the hydroxides just described, add 5 cc.
Ammonium hydroxide is a weak base, as shown in the table above, while the hydroxides of sodium and potassium exhibit strongly basic properties.
They decompose water at ordinary temperatures, forming hydroxides and liberating hydrogen.
Many carbonates and hydroxides decompose directly into the oxide on heating.
Their hydroxides are practically insoluble in water and are very weak bases; indeed, the bases are so weak that their salts are often hydrolyzed into free base and free acid in solution.
The metals are most conveniently prepared by the electrolysis of their fused hydroxides or chlorides, though it is possible to prepare them by reducing their oxides or carbonates with carbon.
They are also called the base-forming elements, since their hydroxides are bases.
A number of elements act in this same way, their hydroxidesunder some conditions being weak acids and under others weak bases.
The hydroxides of tin and free stannic acid, which are easily liberated from these compounds, possess in very marked degree the power of fixing dyes upon fibers, as explained under aluminium.
These hydroxides are white solids; they are readily soluble in water and possess very strong basic properties.
The name alkali metals is commonly applied to the family for the reason that the hydroxides of the most familiar members of the family, namely sodium and potassium, have long been called alkalis.
Compare the properties of the hydroxides of the different groups of metals so far studied.
What hydroxides other than aluminium hydroxide have both acid and basic properties?
Unlike both the alkali and alkaline-earth metals, their hydroxides are nearly insoluble in water.
The distinction between a metal and a non-metal is not a very sharp one, since the hydroxides of a number of elements act as bases under some conditions and as acids under others.
All hydroxides are insoluble save those of ammonium, sodium, potassium, calcium, barium, and strontium.
The most stable basic hydroxidesare those of the alkali metals, viz.
The constitution of the isomeric diazo hydroxides has given rise to much discussion.
According to Hantzsch the isomeric diazo hydroxides are structurally identical, and the differences in behaviour are due to stereo-chemical relations, the isomerism being comparable with that of the oximes (q.
Benzene diazonium hydroxide, although a strong base, reacts with the alkalinehydroxides to form salts with the evolution of heat, and generally behaves as a weak acid.
These hydroxides are bases which neutralise nearly all acids.
In practical chemistry[21 bis] ammonia is often employed, not only for saturating acids, but also for effecting reactions of double decomposition with salts, and especially for separating insoluble basic hydroxides from soluble salts.
Hydrobromic acid reacts with metallic oxides, hydroxides and carbonates to form bromides, which can in many cases be obtained also by the direct union of the metals with bromine.
The ferriferous varieties are liable to a particular kind of alteration, known as "schillerization," which results in the separation of the iron as very fine films of oxide and hydroxides along the cleavage cracks of the mineral.
The solution, obtained by treating the mixture of the sulphides and hydroxides of the aluminium and zinc groups with dilute hydrochloric acid (p.
The members of the aluminium group form hydroxides, which are much weaker bases than are the hydroxides of the bivalent group just considered.
They are precipitated by smaller concentrations of the hydroxide-ion than are the hydroxides of the first group, and their precipitation may be made quantitative.
The precipitate of the aluminium group may contain aluminium, chromium and ferric hydroxides (possibly traces of manganic hydroxide) and their basic carbonates.
While in a ‹series› of elements the acid character of the hydroxides increases with the atomic weight, in a family of elements the reverse relation holds.
By means of barium carbonate [p195] ‹we can, therefore, precipitate the hydroxides of the aluminium group without precipitating the ions of the zinc group.
The amphoteric character of hydroxides is frequently made use of in analytical work in the separation and identification of various elements and, when present, it must always be considered, in order to escape possible error.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "hydroxides" in a variety of sentences. We hope that you will now be able to make sentences using this word.
