If the hydroxide-ion concentration of an aqueous solution is \( 1.05 \times 10^{-12} \frac{\mathrm{~mol}}{\mathrm{~L}} \), what is the \( \left[\mathrm{H}^{+}\right] \)in the solution? Enter an integer or decimal number with units, with exactly 3 significant figures [more..I Is the solution acidic, basic, or neutral? Neutral Acidic Basic

3.Un trozo de hierro de 50 gramos se calienta a \( 100^{\circ} \mathrm{C} \) y luego se pone en agua fria, donde su emperatura baja a \( 30^{\circ} \mathrm{C} \) ¿Cuantas calorias cede el hierro al egua? (Ce s \( \mathrm{e}^{\left.-0.11 \mathrm{cal} / \mathrm{g}^{\circ} \mathrm{C}\right)} \)

Quanti grammi di soluto bisogna aggiungere a \( 50,0 \mathrm{~g} \) di una soluzione al \( 10,0 \% \mathrm{~m} / \mathrm{m} \) perché la sua concentrazione raddoppi?

Which of the following is an example of anionic interference in atomic emission spectroscopy? O Interference of high concentration of sodium ions in assay calcium ions. Interference by formation of less volatile salt with sulphat by calcium. Decreased drop size of the analyte solution by alcohols.

Which of the following is the function of the atomiser in the emission system of Atomic Absorption Spectroscopy? To split the beam into two To break the steady light into pulsating light To break large mass of liquid into small drops To reduce the sample into atomic state

\( - Mg ( OH ) _ { 2 } + \ldots HCl \rightarrow MgCl _ { 2 } + \ldots H _ { 2 } O \)