The concentration of the solution is 5.0 molar, which is 5.0 mole/L. So in the 1.0 L of 5.0 molar KF salt solution, the moles of KF is 5.0molar*1.0L=5.0 mole. The molecular weight of KF is given in the question as 58.10 gram/mole, so the grams of KF is 58.10 gram/mole * 5.0 mole = 290.5 gram.
<span>Compounds are composed of different elements in a fixed proportions. For example, 1 atom of oxygen (O) combines with 2 atoms of hydrogen (H) to form one molecule of water (H2O) compound. Similarly other numbers of atoms would produce other chemical compounds. Even adding 1 more atom of oxygen would convert the water (H2O) into hydrogen peroxide(H2O2). Even if we were only to list the ones we know there are over 20 million known compounds.
In order to list all possible compounds such a table would rapidly become combinatoric nightmare of such size that it would not be practical to use even with a computer database and it would consist of over 100 billion possible compounds containing only H, C, O and N.
Creating a table to handle all possible elements would mean a table of many trillions of compounds.</span>
2.9 is the ph of a buffer solution made by adding 0. 010 mole of solid naf to 50. ml of 0. 40 m HF.
pH
The hydrogen ion concentration in water is expressed by pH. Specific to aqueous solutions, pH is the negative logarithm of the hydrogen ion (H+) concentration (mol/L):
pH equals -log(H+)10
The phrase refers to a solution's basicity or acidity in a range of 0 to 14, with pH 7 representing neutrality. The pH decreases and acidity rise as the concentration of H+ ions in the solution.
Since pH is a logarithmic function, a pH shift of one unit (for example, from 7 to 6) corresponds to a 10x change in the concentration of H+ in the solution. However, hydrogen ion activity, not concentration, is what is actually measured.
To learn more about pH refer here:
brainly.com/question/15239039
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