Calculate the hydronium ion concentration and $\mathrm{pH}$ for a $0.015 \mathrm{M}$ solution of sodium formate, $\mathrm{NaHCO}_2$.

What is the molar concentration of a saturated solution of calcium hydroxide that contains $0.185$ g of solute in $100.0$ mL of solution?

What is the concentration of carbonate ions in a saturated solution of SrCO$_3$? (K$_{sp}$ = 9.3 $\times$ 10$^{-10}$

If $\mathrm{NaCl}$ is doped with $10^{-3} \mathrm{~mol} \%$ of $\mathrm{SrCl}_2$, what is the concentration of cation vacancies?

The inside of the neuron has a lower concentration of positive ions than the outside of the neuron. Is the membrane potential positive or negative?

When benzophenone is exposed to ultraviolet radiation it is excited into a singlet state. This singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experiment in the solvent methanol, the phosphorescence intensity varied with amine concentration as shown below. A time-resolved laser spectroscopy experiment had also shown that the half-life of the phosphorescence in the absence of quencher is $29\ \mu s.$ What is the value of $k_{Q}?$

Calculate the hydrogen ion concentration in moles per liter for each of these solutions: (b) a solution whose $\mathrm{pH}$ is $16.00$.

Calculate the concentration of $\mathrm{HNO}_3$ in a solution at $25^{\circ} \mathrm{C}$ that has a $\mathrm{pH}$ of $3.55$

In terms of collisions between particles , explain why increasing the concentration of reactants in solution would increase the rate of a reaction: _________________________________________________________________________________________________________________________________________

What is the percent-by-mass concentration of sucrose in a solution that is prepared by adding 25.0 g of sucrose to 100.0 g of water?

What is the concentration of $\mathrm{CH}_3 \mathrm{NC}$ after $1.0 \times 10^4 \mathrm{~s}$?

Determine how much water should be added to $2$ liters of $4 \%$ saline solution to reduce the concentration to $3 \%$.

Write two pairs of unit factors for the following aqueou solution given the molar concentration.

$0.100$ M NaNO$_{3}$

The function

$$N(t)=\frac{0.8 t+1000}{5 t+4}, t \geq 15 \text {, }$$

gives the body concentration $N(t)$, in parts per million, of a certain dosage of medication after time $t$, in hours. $\\$ a) Graph the function on the interval$[15, \infty)$and complete the following:$ $N(t) \rightarrow \square \text { as } t \rightarrow \infty.$$ b) Explain the meaning of the answer to part (a) in terms of the application.