{"id":245079,"date":"2024-07-29T16:00:53","date_gmt":"2024-07-29T08:00:53","guid":{"rendered":"https:\/\/thepiquelab.com\/blog\/?p=245079"},"modified":"2026-02-13T11:23:33","modified_gmt":"2026-02-13T03:23:33","slug":"solutions-suspensions-understanding-solubility-temperature-graphs","status":"publish","type":"post","link":"https:\/\/thepiquelab.com\/blog\/solutions-suspensions-understanding-solubility-temperature-graphs\/","title":{"rendered":"Solutions & Suspensions: Understanding Solubility-Temperature Graphs"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_row _builder_version=”4.21.0″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_text _builder_version=”4.21.0″ hover_enabled=”0″ z_index_tablet=”500″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n

Introduction<\/strong><\/p>\n

Welcome to another blog post on the topic of Solutions & Suspensions!<\/p>\n

Do you find graphs confusing so you often get stuck when you see them in your examination paper?<\/p>\n

Keep on reading because, in this blog post, I will be teaching you how to analyse solubility and temperature graphs so you can arrive at the correct conclusion.<\/p>\n

Alternatively, you can watch our explainer video by clicking this link<\/a>.<\/p>\n

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Read Also:<\/h3>\n
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  1. [Secondary 1 Science Explainer Video] Solutions & Suspensions: Understanding Solubility-Temperature Graphs\u00a0<\/a><\/strong><\/li>\n
  2. Solutions & Suspensions: How Is Solubility Tested In Chemistry Examinations?<\/strong><\/a><\/li>\n<\/ol>\n<\/div>\n

    Let’s Take A Look At This Solutions & Suspensions Question<\/h2>\n

    \"\"<\/p>\n

    Source: Holy Innocents\u2019 High School \u2013 S1(NA) SA2 Examination Paper [Q5]<\/span><\/em>
    <\/p>\n\n

    <\/p>\n

    Thought Process<\/h2>\n
    \n

    \ud83d\udca7\u00a0What Is Solubility?<\/strong> \ud83d\udca7<\/p>\n

    Solubility is the maximum amount of solute that can dissolve in a given amount of solvent.<\/p>\n<\/blockquote>\n

    In the case of our experiment, we have 1 litre of the solvent at a fixed temperature.<\/p>\n

    Let us draw a straight line from the x<\/em>-axis, growing upwards to touch graph R. The red line in the graph below represents the maximum amount of Solute P that can dissolve in Solvent R at that temperature.<\/p>\n

    \"\"<\/p>\n

    Source: Holy Innocents\u2019 High School \u2013 S1(NA) SA2 Examination Paper [Q5]<\/span><\/em><\/p>\n

    Let us continue the straight line from the fixed temperature and touch graph Q. The purple line in the graph below represents the maximum amount of Solute P that can dissolve in Solvent Q.<\/p>\n

    \"\"<\/p>\n

    Let us compare the positions of the purple and red lines. Which is higher? The purple line is higher than the red line.<\/p>\n

    What does this mean?<\/p>\n

    This means that more Solute P can dissolve in Solvent Q compared to Solvent R at the same fixed temperature.<\/p>\n

    \"\"<\/p>\n

    Considering this information, does Solute P dissolve more easily in Solvent Q or Solvent R?<\/p>\n

    Solute P dissolves more easily in Solvent Q<\/strong>!<\/p>\n

    A trick that we can use for this question is to look at the gradients for graph Q and graph R.<\/p>\n

    Which graph is steeper?<\/p>\n

    The graph of Solvent Q is steeper! Since it is steeper, it means that Solute P would have a higher solubility in Solvent Q.<\/p>\n

    \"\"<\/p>\n

    Now that we know these information, let us begin analysing the different options.<\/p>\n

    <\/strong><\/p>\n

    Let’s Analyse Option (1)<\/h2>\n

    \"\"<\/p>\n

    Source: Holy Innocents\u2019 High School \u2013 S1(NA) SA2 Examination Paper [Q5]<\/span><\/em><\/p>\n

    Is Solute P insoluble in both solvents Q and R?<\/p>\n

    We know that this is not true<\/strong> since P can dissolve<\/strong> in both solvents!<\/p>\n

    Therefore, this option is wrong.<\/p>\n

    <\/p>\n

    Let’s Analyse Option (2)<\/h2>\n

    \"\"<\/p>\n

    Source: Holy Innocents\u2019 High School \u2013 S1(NA) SA2 Examination Paper [Q5]<\/em><\/p>\n

    Next, does Solute P have a lower solubility in Solvent Q than in Solvent R?<\/p>\n

    In fact, the opposite is true<\/strong>! Solute P has a higher solubility<\/strong> in Solvent Q than in Solvent R.<\/p>\n

    So, this option is wrong too.<\/p>\n

    <\/p>\n

    Let’s Analyse Option (3)<\/h2>\n

    \"\"<\/p>\n

    Source: Holy Innocents\u2019 High School \u2013 S1(NA) SA2 Examination Paper [Q5]<\/em><\/p>\n

    Does Solute P have a higher solubility in Solvent Q than in Solvent R?<\/p>\n

    Refer back to the graph. You can confirm that Solute P indeed has a higher solubility<\/strong> in Solvent Q than in Solvent R.<\/p>\n

    So this option is correct.<\/p>\n

    But before concluding that this is the correct answer, let us first take a look at option (4).<\/p>\n

    <\/p>\n

    Let’s Analyse Option (4)<\/h2>\n

    \"\"<\/p>\n

    Source: Holy Innocents\u2019 High School \u2013 S1(NA) SA2 Examination Paper [Q5]<\/em><\/p>\n

    Does Solute P have a similar solubility in both Solvents Q and R?<\/p>\n

    It does not<\/strong> have similar solubilities in both solvents.<\/p>\n

    Therefore, this option is wrong as well.<\/p>\n

    <\/p>\n

    Suggested Answer<\/h2>\n

    \"\"<\/p>\n

    Therefore, we can conclude that the correct answer is (3).<\/p>\n

    <\/p>\n

    Conclusion<\/h2>\n

    I hope that after reading this blog post, you\u2019ve learned how to read a solubility-temperature graph accurately!<\/p>\n

    Because the line for Solvent Q is steeper than Solvent R, it means that Solute P has a higher solubility in Q than in R.<\/p>\n

    Make notes on the graph as we did above so that you can:<\/p>\n