Answer:
(a) pH = 1
(b) pH = 7
(c) 60 mL
Explanation:
(a) At the start of the titration, there is only 0.1 M HCl, which is a strong acid, according to the following expression.
HCl → H⁺ + Cl⁻
The concentration of H⁺ is 0.1 M as well and the pH is:
pH = -log [H⁺] = -log 0.1 = 1
(b) The reaction between HCl and NaOH is:
HCl + NaOH → NaCl + H₂O
At the equivalence point, all the HCl and NaOH have reacted. Since NaCl does not contribute to the pH, the pH is 7.
(c) The moles of HCl are:
(0.1 mol/L) × (30.0 × 10⁻³ L) = 3 × 10⁻³ mol
The molar ratio of HCl to NaOH is 1:1, so we also have 3 × 10⁻³ moles of NaOH. The volume of NaOH that contains these moles is:
3 × 10⁻³ mol / (0.1 mol/L) = 0.03 L = 30 mL
The total volume is:
V(HCl) + V(NaOH) = 30 mL + 30 mL = 60 mL
Answer:
Explanation:
An independent variable is a variable in which does not rely on how other variables. It is usually cause in an experiment. From Sara Lilia experiment, we can identify the different music genres as her independent variable.
The dependent variable here is her ability to concentrate in her study. Here, we should know that the dependent variable is often the result of the effects of the independent variable.
There is no control in the experiment. In the controlled set up, we would have put all other know factors that would make concentrations easier into consideration. It could be the environment, the arrangement of the room and a particular time of the day. None of such was stated in the experiment.
The constant variable is the variable that was held fixed throughout the experimental procedure. Here the time of study was fixed at 5minutes. What would happen to concentration if this time was shorter or much more?
I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.
<h3>What is a compound?</h3>
A compound is formed by the combination of atoms. It is important to note that the same atoms can be combined in different ways to produce new compounds.
I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.
Learn more about compounds:brainly.com/question/13516179?
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